}
	js = append(js, '\n')
	if err := sh.writeFile(a.Objdir+"vet.cfg", js); err != nil {
		return err
	}

	// TODO(rsc): Why do we pass $GCCGO to go vet?
	env := b.cCompilerEnv()
	if cfg.BuildToolchainName == "gccgo" {
		env = append(env, "GCCGO="+BuildToolchain.compiler())
	}

	p := a.Package
	tool := VetTool
	if tool == "" {
		tool = base.Tool("vet")
	}

	if str.HasPathPrefix(p.ImportPath, "testing/internal") && importerPath == "testmain" {
		return nil
	}

	// We can't check standard packages with gccgo.
	if cfg.BuildContext.Compiler == "gccgo" && p.Standard {
		return nil
	}

	// The sort package depends on internal/reflectlite, but during bootstrap
	// the path rewriting causes the normal internal checks to fail.

//
//	GO111MODULE
//		Controls whether the go command runs in module-aware mode or GOPATH mode.
//		May be "off", "on", or "auto".
//		See https://golang.org/ref/mod#mod-commands.
//	GCCGO
//		The gccgo command to run for 'go build -compiler=gccgo'.
//	GOARCH
//		The architecture, or processor, for which to compile code.
//		Examples are amd64, 386, arm, ppc64.
//	GOBIN

		StructOf([]StructField{
			{Type: TypeOf("")},
			{Type: TypeOf("")},
		})
	})
	// check that type already in binary is found
	checkSameType(t, StructOf(fields[2:3]), struct{ Y uint64 }{})

	// gccgo used to fail this test.
	type structFieldType any
	checkSameType(t,
		StructOf([]StructField{
			{
				Name: "F",
				Type: TypeOf((*structFieldType)(nil)).Elem(),
			},
		}),