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Support Fennel. (#530)
This adds support for the Fennel programming language: https://fennel-lang.org I couldn't find much explanation for what the different lexer rules meant, so I based it off of Clojure's lexer since the two languages share a very similar syntax. I also included a program to generate a list of keywords from Fennel's own listing, which will make it easier to update in the future.
This commit is contained in:
Phil Hagelberg
GitHub
parent
21a1750dc2
commit
d402102976
66
lexers/f/fennel.go
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66
lexers/f/fennel.go
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@ -0,0 +1,66 @@
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package f
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import (
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. "github.com/alecthomas/chroma" // nolint
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"github.com/alecthomas/chroma/lexers/internal"
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)
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// Fennel lexer.
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var Fennel = internal.Register(MustNewLazyLexer(
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&Config{
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Name: "Fennel",
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Aliases: []string{"fennel", "fnl"},
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Filenames: []string{"*.fennel"},
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MimeTypes: []string{"text/x-fennel", "application/x-fennel"},
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},
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fennelRules,
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))
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// Here's some Fennel code used to generate the lists of keywords:
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// (local fennel (require :fennel))
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//
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// (fn member? [t x] (each [_ y (ipairs t)] (when (= y x) (lua "return true"))))
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//
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// (local declarations [:fn :lambda :λ :local :var :global :macro :macros])
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// (local keywords [])
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// (local globals [])
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//
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// (each [name data (pairs (fennel.syntax))]
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// (if (member? declarations name) nil ; already populated
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// data.special? (table.insert keywords name)
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// data.macro? (table.insert keywords name)
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// data.global? (table.insert globals name)))
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//
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// (fn quoted [tbl]
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// (table.sort tbl)
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// (table.concat (icollect [_ k (ipairs tbl)]
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// (string.format "`%s`" k)) ", "))
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//
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// (print :Keyword (quoted keywords))
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// (print :KeywordDeclaration (quoted declarations))
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// (print :NameBuiltin (quoted globals))
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func fennelRules() Rules {
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return Rules{
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"root": {
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{`;.*$`, CommentSingle, nil},
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{`\s+`, Whitespace, nil},
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{`-?\d+\.\d+`, LiteralNumberFloat, nil},
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{`-?\d+`, LiteralNumberInteger, nil},
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{`0x-?[abcdef\d]+`, LiteralNumberHex, nil},
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{`"(\\\\|\\"|[^"])*"`, LiteralString, nil},
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{`'(?!#)[\w!$%*+<=>?/.#-]+`, LiteralStringSymbol, nil},
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{`\\(.|[a-z]+)`, LiteralStringChar, nil},
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{`::?#?(?!#)[\w!$%*+<=>?/.#-]+`, LiteralStringSymbol, nil},
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{"~@|[`\\'#^~&@]", Operator, nil},
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{Words(``, ` `, `#`, `%`, `*`, `+`, `-`, `->`, `->>`, `-?>`, `-?>>`, `.`, `..`, `/`, `//`, `:`, `<`, `<=`, `=`, `>`, `>=`, `?.`, `^`, `accumulate`, `and`, `band`, `bnot`, `bor`, `bxor`, `collect`, `comment`, `do`, `doc`, `doto`, `each`, `eval-compiler`, `for`, `hashfn`, `icollect`, `if`, `import-macros`, `include`, `length`, `let`, `lshift`, `lua`, `macrodebug`, `match`, `not`, `not=`, `or`, `partial`, `pick-args`, `pick-values`, `quote`, `require-macros`, `rshift`, `set`, `set-forcibly!`, `tset`, `values`, `when`, `while`, `with-open`, `~=`), Keyword, nil},
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{Words(``, ` `, `fn`, `global`, `lambda`, `local`, `macro`, `macros`, `var`, `λ`), KeywordDeclaration, nil},
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{Words(``, ` `, `_G`, `arg`, `assert`, `bit32`, `bit32.arshift`, `bit32.band`, `bit32.bnot`, `bit32.bor`, `bit32.btest`, `bit32.bxor`, `bit32.extract`, `bit32.lrotate`, `bit32.lshift`, `bit32.replace`, `bit32.rrotate`, `bit32.rshift`, `collectgarbage`, `coroutine`, `coroutine.create`, `coroutine.resume`, `coroutine.running`, `coroutine.status`, `coroutine.wrap`, `coroutine.yield`, `debug`, `debug.debug`, `debug.gethook`, `debug.getinfo`, `debug.getlocal`, `debug.getmetatable`, `debug.getregistry`, `debug.getupvalue`, `debug.getuservalue`, `debug.sethook`, `debug.setlocal`, `debug.setmetatable`, `debug.setupvalue`, `debug.setuservalue`, `debug.traceback`, `debug.upvalueid`, `debug.upvaluejoin`, `dofile`, `error`, `getmetatable`, `io`, `io.close`, `io.flush`, `io.input`, `io.lines`, `io.open`, `io.output`, `io.popen`, `io.read`, `io.tmpfile`, `io.type`, `io.write`, `ipairs`, `load`, `loadfile`, `loadstring`, `math`, `math.abs`, `math.acos`, `math.asin`, `math.atan`, `math.atan2`, `math.ceil`, `math.cos`, `math.cosh`, `math.deg`, `math.exp`, `math.floor`, `math.fmod`, `math.frexp`, `math.ldexp`, `math.log`, `math.log10`, `math.max`, `math.min`, `math.modf`, `math.pow`, `math.rad`, `math.random`, `math.randomseed`, `math.sin`, `math.sinh`, `math.sqrt`, `math.tan`, `math.tanh`, `module`, `next`, `os`, `os.clock`, `os.date`, `os.difftime`, `os.execute`, `os.exit`, `os.getenv`, `os.remove`, `os.rename`, `os.setlocale`, `os.time`, `os.tmpname`, `package`, `package.loadlib`, `package.searchpath`, `package.seeall`, `pairs`, `pcall`, `print`, `rawequal`, `rawget`, `rawlen`, `rawset`, `require`, `select`, `setmetatable`, `string`, `string.byte`, `string.char`, `string.dump`, `string.find`, `string.format`, `string.gmatch`, `string.gsub`, `string.len`, `string.lower`, `string.match`, `string.rep`, `string.reverse`, `string.sub`, `string.upper`, `table`, `table.concat`, `table.insert`, `table.maxn`, `table.pack`, `table.remove`, `table.sort`, `table.unpack`, `tonumber`, `tostring`, `type`, `unpack`, `xpcall`), NameBuiltin, nil},
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{`(?<=\()(?!#)[\w!$%*+<=>?/.#-]+`, NameFunction, nil},
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{`(?!#)[\w!$%*+<=>?/.#-]+`, NameVariable, nil},
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{`(\[|\])`, Punctuation, nil},
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{`(\{|\})`, Punctuation, nil},
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{`(\(|\))`, Punctuation, nil},
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},
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}
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}
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75
lexers/testdata/fennel.actual
vendored
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75
lexers/testdata/fennel.actual
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@ -0,0 +1,75 @@
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;; An example of some possible linters using Fennel's --plugin option.
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;; The first two linters here can only function on static module
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;; use. For instance, this code can be checked because they use static
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;; field access on a local directly bound to a require call:
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;; (local m (require :mymodule))
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;; (print m.field) ; fails if mymodule lacks a :field field
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;; (print (m.function 1 2 3)) ; fails unless mymodule.function takes 3 args
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;; However, these cannot:
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;; (local m (do (require :mymodule)) ; m is not directly bound
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;; (print (. m field)) ; not a static field reference
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;; (let [f m.function]
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;; (print (f 1 2 3)) ; intermediate local, not a static field call on m
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;; Still, pretty neat, huh?
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;; This file is provided as an example and is not part of Fennel's public API.
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(fn save-require-meta [from to scope]
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"When destructuring, save module name if local is bound to a `require' call.
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Doesn't do any linting on its own; just saves the data for other linters."
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(when (and (sym? to) (not (multi-sym? to)) (list? from)
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(sym? (. from 1)) (= :require (tostring (. from 1)))
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(= :string (type (. from 2))))
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(let [meta (. scope.symmeta (tostring to))]
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(set meta.required (tostring (. from 2))))))
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(fn check-module-fields [symbol scope]
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"When referring to a field in a local that's a module, make sure it exists."
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(let [[module-local field] (or (multi-sym? symbol) [])
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module-name (-?> scope.symmeta (. (tostring module-local)) (. :required))
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module (and module-name (require module-name))]
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(assert-compile (or (= module nil) (not= (. module field) nil))
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(string.format "Missing field %s in module %s"
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(or field :?) (or module-name :?)) symbol)))
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(fn arity-check? [module] (-?> module getmetatable (. :arity-check?)))
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(fn arity-check-call [[f & args] scope]
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"Perform static arity checks on static function calls in a module."
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(let [arity (# args)
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last-arg (. args arity)
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[f-local field] (or (multi-sym? f) [])
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module-name (-?> scope.symmeta (. (tostring f-local)) (. :required))
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module (and module-name (require module-name))]
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(when (and (arity-check? module) _G.debug _G.debug.getinfo
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(not (varg? last-arg)) (not (list? last-arg)))
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(assert-compile (= (type (. module field)) :function)
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(string.format "Missing function %s in module %s"
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(or field :?) module-name) f)
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(match (_G.debug.getinfo (. module field))
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{: nparams :what "Lua" :isvararg true}
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(assert-compile (<= nparams (# args))
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(: "Called %s.%s with %s arguments, expected %s+"
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:format f-local field arity nparams) f)
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{: nparams :what "Lua" :isvararg false}
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(assert-compile (= nparams (# args))
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(: "Called %s.%s with %s arguments, expected %s"
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:format f-local field arity nparams) f)))))
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(fn check-unused [ast scope]
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(each [symname (pairs scope.symmeta)]
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(assert-compile (or (. scope.symmeta symname :used) (symname:find "^_"))
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(string.format "unused local %s" (or symname :?)) ast)))
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{:destructure save-require-meta
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:symbol-to-expression check-module-fields
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:call arity-check-call
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;; Note that this will only check unused args inside functions and let blocks,
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;; not top-level locals of a chunk.
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:fn check-unused
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:do check-unused}
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572
lexers/testdata/fennel.expected
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572
lexers/testdata/fennel.expected
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@ -0,0 +1,572 @@
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[
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{"type":"CommentSingle","value":";; An example of some possible linters using Fennel's --plugin option."},
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{"type":"TextWhitespace","value":"\n\n"},
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{"type":"CommentSingle","value":";; The first two linters here can only function on static module"},
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{"type":"TextWhitespace","value":"\n"},
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{"type":"CommentSingle","value":";; use. For instance, this code can be checked because they use static"},
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{"type":"TextWhitespace","value":"\n"},
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{"type":"CommentSingle","value":";; field access on a local directly bound to a require call:"},
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{"type":"TextWhitespace","value":"\n\n"},
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{"type":"CommentSingle","value":";; (local m (require :mymodule))"},
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{"type":"TextWhitespace","value":"\n"},
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{"type":"CommentSingle","value":";; (print m.field) ; fails if mymodule lacks a :field field"},
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{"type":"TextWhitespace","value":"\n"},
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{"type":"CommentSingle","value":";; (print (m.function 1 2 3)) ; fails unless mymodule.function takes 3 args"},
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{"type":"TextWhitespace","value":"\n\n"},
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{"type":"CommentSingle","value":";; However, these cannot:"},
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{"type":"TextWhitespace","value":"\n\n"},
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{"type":"CommentSingle","value":";; (local m (do (require :mymodule)) ; m is not directly bound"},
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{"type":"TextWhitespace","value":"\n"},
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{"type":"CommentSingle","value":";; (print (. m field)) ; not a static field reference"},
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{"type":"TextWhitespace","value":"\n"},
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{"type":"CommentSingle","value":";; (let [f m.function]"},
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{"type":"TextWhitespace","value":"\n"},
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{"type":"CommentSingle","value":";; (print (f 1 2 3)) ; intermediate local, not a static field call on m"},
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{"type":"TextWhitespace","value":"\n\n"},
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{"type":"CommentSingle","value":";; Still, pretty neat, huh?"},
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{"type":"TextWhitespace","value":"\n\n"},
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{"type":"CommentSingle","value":";; This file is provided as an example and is not part of Fennel's public API."},
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{"type":"TextWhitespace","value":"\n\n"},
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{"type":"Punctuation","value":"("},
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{"type":"KeywordDeclaration","value":"fn "},
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{"type":"NameVariable","value":"save-require-meta"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"["},
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{"type":"NameVariable","value":"from"},
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{"type":"TextWhitespace","value":" "},
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{"type":"NameVariable","value":"to"},
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{"type":"TextWhitespace","value":" "},
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{"type":"NameVariable","value":"scope"},
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{"type":"Punctuation","value":"]"},
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{"type":"TextWhitespace","value":"\n "},
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{"type":"LiteralString","value":"\"When destructuring, save module name if local is bound to a `require' call.\nDoesn't do any linting on its own; just saves the data for other linters.\""},
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{"type":"TextWhitespace","value":"\n "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":"when "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":"and "},
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{"type":"Punctuation","value":"("},
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{"type":"NameFunction","value":"sym?"},
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{"type":"TextWhitespace","value":" "},
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{"type":"NameVariable","value":"to"},
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{"type":"Punctuation","value":")"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":"not "},
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{"type":"Punctuation","value":"("},
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{"type":"NameFunction","value":"multi-sym?"},
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{"type":"TextWhitespace","value":" "},
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{"type":"NameVariable","value":"to"},
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{"type":"Punctuation","value":"))"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"("},
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{"type":"NameFunction","value":"list?"},
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{"type":"TextWhitespace","value":" "},
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{"type":"NameVariable","value":"from"},
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{"type":"Punctuation","value":")"},
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{"type":"TextWhitespace","value":"\n "},
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{"type":"Punctuation","value":"("},
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{"type":"NameFunction","value":"sym?"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":". "},
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{"type":"NameVariable","value":"from"},
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{"type":"TextWhitespace","value":" "},
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{"type":"LiteralNumberInteger","value":"1"},
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{"type":"Punctuation","value":"))"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":"= "},
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{"type":"LiteralStringSymbol","value":":require"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"("},
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{"type":"NameBuiltin","value":"tostring "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":". "},
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{"type":"NameVariable","value":"from"},
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{"type":"TextWhitespace","value":" "},
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{"type":"LiteralNumberInteger","value":"1"},
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{"type":"Punctuation","value":")))"},
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{"type":"TextWhitespace","value":"\n "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":"= "},
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{"type":"LiteralStringSymbol","value":":string"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"("},
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{"type":"NameBuiltin","value":"type "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":". "},
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{"type":"NameVariable","value":"from"},
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{"type":"TextWhitespace","value":" "},
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{"type":"LiteralNumberInteger","value":"2"},
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{"type":"Punctuation","value":"))))"},
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{"type":"TextWhitespace","value":"\n "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":"let "},
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{"type":"Punctuation","value":"["},
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{"type":"NameVariable","value":"meta"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":". "},
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{"type":"NameVariable","value":"scope.symmeta"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"("},
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{"type":"NameBuiltin","value":"tostring "},
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{"type":"NameVariable","value":"to"},
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{"type":"Punctuation","value":"))]"},
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{"type":"TextWhitespace","value":"\n "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":"set "},
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{"type":"NameVariable","value":"meta.required"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"("},
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{"type":"NameBuiltin","value":"tostring "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":". "},
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{"type":"NameVariable","value":"from"},
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{"type":"TextWhitespace","value":" "},
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{"type":"LiteralNumberInteger","value":"2"},
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{"type":"Punctuation","value":"))))))"},
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{"type":"TextWhitespace","value":"\n\n"},
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{"type":"Punctuation","value":"("},
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{"type":"KeywordDeclaration","value":"fn "},
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{"type":"NameVariable","value":"check-module-fields"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"["},
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{"type":"NameVariable","value":"symbol"},
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{"type":"TextWhitespace","value":" "},
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{"type":"NameVariable","value":"scope"},
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{"type":"Punctuation","value":"]"},
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{"type":"TextWhitespace","value":"\n "},
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{"type":"LiteralString","value":"\"When referring to a field in a local that's a module, make sure it exists.\""},
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{"type":"TextWhitespace","value":"\n "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":"let "},
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{"type":"Punctuation","value":"[["},
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{"type":"NameVariable","value":"module-local"},
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{"type":"TextWhitespace","value":" "},
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{"type":"NameVariable","value":"field"},
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{"type":"Punctuation","value":"]"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":"or "},
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{"type":"Punctuation","value":"("},
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{"type":"NameFunction","value":"multi-sym?"},
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{"type":"TextWhitespace","value":" "},
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{"type":"NameVariable","value":"symbol"},
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{"type":"Punctuation","value":")"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"[])"},
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{"type":"TextWhitespace","value":"\n "},
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{"type":"NameVariable","value":"module-name"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":"-?\u003e "},
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{"type":"NameVariable","value":"scope.symmeta"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":". "},
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{"type":"Punctuation","value":"("},
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{"type":"NameBuiltin","value":"tostring "},
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{"type":"NameVariable","value":"module-local"},
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{"type":"Punctuation","value":"))"},
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{"type":"TextWhitespace","value":" "},
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{"type":"Punctuation","value":"("},
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{"type":"Keyword","value":". "},
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{"type":"LiteralStringSymbol","value":":required"},
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{"type":"Punctuation","value":"))"},
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{"type":"TextWhitespace","value":"\n "},
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{"type":"NameBuiltin","value":"module "},
|
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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|
||||
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||||
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||||
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|
||||
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||||
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|
||||
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||||
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|
||||
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|
||||
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||||
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||||
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||||
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|
||||
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|
||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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|
||||
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||||
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|
||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
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||||
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||||
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||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
{"type":"NameVariable","value":"scope"},
|
||||
{"type":"Punctuation","value":"]"},
|
||||
{"type":"TextWhitespace","value":"\n "},
|
||||
{"type":"Punctuation","value":"("},
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
{"type":"NameBuiltin","value":"pairs "},
|
||||
{"type":"NameVariable","value":"scope.symmeta"},
|
||||
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|
||||
{"type":"TextWhitespace","value":"\n "},
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
{"type":"Keyword","value":". "},
|
||||
{"type":"NameVariable","value":"scope.symmeta"},
|
||||
{"type":"TextWhitespace","value":" "},
|
||||
{"type":"NameVariable","value":"symname"},
|
||||
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|
||||
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|
||||
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|
||||
{"type":"TextWhitespace","value":" "},
|
||||
{"type":"Punctuation","value":"("},
|
||||
{"type":"NameFunction","value":"symname"},
|
||||
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|
||||
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|
||||
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|
||||
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|
||||
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|
||||
{"type":"Punctuation","value":"("},
|
||||
{"type":"NameBuiltin","value":"string.format "},
|
||||
{"type":"LiteralString","value":"\"unused local %s\""},
|
||||
{"type":"TextWhitespace","value":" "},
|
||||
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|
||||
{"type":"Keyword","value":"or "},
|
||||
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|
||||
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|
||||
{"type":"LiteralStringSymbol","value":":?"},
|
||||
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|
||||
{"type":"TextWhitespace","value":" "},
|
||||
{"type":"NameVariable","value":"ast"},
|
||||
{"type":"Punctuation","value":")))"},
|
||||
{"type":"TextWhitespace","value":"\n\n"},
|
||||
{"type":"Punctuation","value":"{"},
|
||||
{"type":"LiteralStringSymbol","value":":destructure"},
|
||||
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|
||||
{"type":"NameVariable","value":"save-require-meta"},
|
||||
{"type":"TextWhitespace","value":"\n "},
|
||||
{"type":"LiteralStringSymbol","value":":symbol-to-expression"},
|
||||
{"type":"TextWhitespace","value":" "},
|
||||
{"type":"NameVariable","value":"check-module-fields"},
|
||||
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|
||||
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|
||||
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|
||||
{"type":"NameVariable","value":"arity-check-call"},
|
||||
{"type":"TextWhitespace","value":"\n "},
|
||||
{"type":"CommentSingle","value":";; Note that this will only check unused args inside functions and let blocks,"},
|
||||
{"type":"TextWhitespace","value":"\n "},
|
||||
{"type":"CommentSingle","value":";; not top-level locals of a chunk."},
|
||||
{"type":"TextWhitespace","value":"\n "},
|
||||
{"type":"LiteralStringSymbol","value":":fn"},
|
||||
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|
||||
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|
||||
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|
||||
{"type":"LiteralStringSymbol","value":":do"},
|
||||
{"type":"TextWhitespace","value":" "},
|
||||
{"type":"NameVariable","value":"check-unused"},
|
||||
{"type":"Punctuation","value":"}"},
|
||||
{"type":"TextWhitespace","value":"\n"}
|
||||
]
|
||||
Loading…
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Reference in New Issue
Block a user