fix: interpolate vars in defer (#2173)

task.go

@@ -297,6 +297,8 @@ func (e *Executor) runDeferred(t *ast.Task, call *Call, i int, deferredExitCode
 	}
 
 	cmd.Cmd = templater.ReplaceWithExtra(cmd.Cmd, cache, extra)
+	cmd.Task = templater.ReplaceWithExtra(cmd.Task, cache, extra)
+	cmd.Vars = templater.ReplaceVarsWithExtra(cmd.Vars, cache, extra)
 
 	if err := e.runCommand(ctx, t, call, i); err != nil {
 		e.Logger.VerboseErrf(logger.Yellow, "task: ignored error in deferred cmd: %s\n", err.Error())

task_test.go

@@ -1809,6 +1809,9 @@ task-1 ran successfully
 `)
 	require.Error(t, e.Run(context.Background(), &task.Call{Task: "task-2"}))
 	assert.Contains(t, buff.String(), expectedOutputOrder)
+	buff.Reset()
+	require.NoError(t, e.Run(context.Background(), &task.Call{Task: "parent"}))
+	assert.Contains(t, buff.String(), "child task deferred value-from-parent")
 }
 
 func TestExitCodeZero(t *testing.T) {

testdata/deferred/Taskfile.yml

@@ -12,3 +12,18 @@ tasks:
     - defer: echo 'failing' && exit 2
     - echo 'cmd ran'
     - exit 1
+
+  parent:
+    vars:
+      VAR1: "value-from-parent"
+    cmds:
+      - defer:
+          task: child
+          vars:
+            VAR1: 'task deferred {{.VAR1}}'
+      - task: child
+        vars:
+          VAR1: 'task immediate {{.VAR1}}'
+  child:
+    cmds:
+    - cmd: echo "child {{.VAR1}}"