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// Copyright 2023 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.
// Package shadow defines an Analyzer that checks for shadowed variables.
//
// # Analyzer shadow
//
// shadow: check for possible unintended shadowing of variables
//
// This analyzer check for shadowed variables.
// A shadowed variable is a variable declared in an inner scope
// with the same name and type as a variable in an outer scope,
// and where the outer variable is mentioned after the inner one
// is declared.
//
// (This definition can be refined; the module generates too many
// false positives and is not yet enabled by default.)
//
// For example:
//
// func BadRead(f *os.File, buf []byte) error {
// var err error
// for {
// n, err := f.Read(buf) // shadows the function variable 'err'
// if err != nil {
// break // causes return of wrong value
// }
// foo(buf)
// }
// return err
// }
package shadow
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