pcre2: small polishing

crates/pcre2/Cargo.toml

@@ -15,5 +15,5 @@ edition = "2018"
 
 [dependencies]
 grep-matcher = { version = "0.1.6", path = "../matcher" }
-log = "0.4.19"
+log = "0.4.20"
 pcre2 = "0.2.4"

crates/pcre2/src/error.rs

@@ -1,6 +1,3 @@
-use std::error;
-use std::fmt;
-
 /// An error that can occur in this crate.
 ///
 /// Generally, this error corresponds to problems building a regular
@@ -12,7 +9,7 @@ pub struct Error {
 }
 
 impl Error {
-    pub(crate) fn regex<E: error::Error>(err: E) -> Error {
+    pub(crate) fn regex<E: std::error::Error>(err: E) -> Error {
         Error { kind: ErrorKind::Regex(err.to_string()) }
     }
 
@@ -24,6 +21,7 @@ impl Error {
 
 /// The kind of an error that can occur.
 #[derive(Clone, Debug)]
+#[non_exhaustive]
 pub enum ErrorKind {
     /// An error that occurred as a result of parsing a regular expression.
     /// This can be a syntax error or an error that results from attempting to
@@ -31,29 +29,20 @@ pub enum ErrorKind {
     ///
     /// The string here is the underlying error converted to a string.
     Regex(String),
-    /// Hints that destructuring should not be exhaustive.
-    ///
-    /// This enum may grow additional variants, so this makes sure clients
-    /// don't count on exhaustive matching. (Otherwise, adding a new variant
-    /// could break existing code.)
-    #[doc(hidden)]
-    __Nonexhaustive,
 }
 
-impl error::Error for Error {
+impl std::error::Error for Error {
     fn description(&self) -> &str {
         match self.kind {
             ErrorKind::Regex(_) => "regex error",
-            ErrorKind::__Nonexhaustive => unreachable!(),
         }
     }
 }
 
-impl fmt::Display for Error {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+impl std::fmt::Display for Error {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self.kind {
             ErrorKind::Regex(ref s) => write!(f, "{}", s),
-            ErrorKind::__Nonexhaustive => unreachable!(),
         }
     }
 }

crates/pcre2/src/lib.rs

@@ -5,9 +5,12 @@ An implementation of `grep-matcher`'s `Matcher` trait for
 
 #![deny(missing_docs)]
 
-pub use crate::error::{Error, ErrorKind};
-pub use crate::matcher::{RegexCaptures, RegexMatcher, RegexMatcherBuilder};
 pub use pcre2::{is_jit_available, version};
 
+pub use crate::{
+    error::{Error, ErrorKind},
+    matcher::{RegexCaptures, RegexMatcher, RegexMatcherBuilder},
+};
+
 mod error;
 mod matcher;

crates/pcre2/src/matcher.rs

@@ -1,7 +1,9 @@
 use std::collections::HashMap;
 
-use grep_matcher::{Captures, Match, Matcher};
-use pcre2::bytes::{CaptureLocations, Regex, RegexBuilder};
+use {
+    grep_matcher::{Captures, Match, Matcher},
+    pcre2::bytes::{CaptureLocations, Regex, RegexBuilder},
+};
 
 use crate::error::Error;
 
@@ -426,9 +428,10 @@ fn has_uppercase_literal(pattern: &str) -> bool {
 
 #[cfg(test)]
 mod tests {
-    use super::*;
     use grep_matcher::{LineMatchKind, Matcher};
 
+    use super::*;
+
     // Test that enabling word matches does the right thing and demonstrate
     // the difference between it and surrounding the regex in `\b`.
     #[test]