code review 12507043: cmd/vet: add an "unused" module

cmd/vet/types.go

 // Copyright 2010 The Go Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 // This file contains the pieces of the tool that use typechecking from the go/types package.
 
 package main
 
 import (
         "go/ast"
@@ skipping 15 matching lines @@
         // past the first error. There is no need for that function to do anything.
         config := types.Config{
                 Error: func(error) {},
         }
         info := &types.Info{
                 Types:     pkg.types,
                 Values:    pkg.values,
                 Objects:   pkg.idents,
                 Implicits: pkg.implicits,
         }
-        _, err := config.Check(pkg.path, fs, astFiles, info)
+        var err error
+        pkg.typesPackage, err = config.Check(pkg.path, fs, astFiles, info)
         // Update spans.
         for id, obj := range pkg.idents {
                 pkg.growSpan(id, obj)
         }
         return err
 }
 
 // isStruct reports whether the composite literal c is a struct.
 // If it is not (probably a struct), it returns a printable form of the type.
 func (pkg *Package) isStruct(c *ast.CompositeLit) (bool, string) {
@@ skipping 231 matching lines @@
                 return false
         }
         // Finally the real questions.
         // There must be one result.
         if sig.Results().Len() != 1 {
                 return false
         }
         // It must have return type "string" from the universe.
         return sig.Results().At(0).Type() == types.Typ[types.String]
 }