go/types, types2: rename Environment to Context

Replace the name Environment with Context, as discussed in #47916. Along
the way, fix some stale or inaccurate comments.

The Environment type remains temporarily as an alias for Context, to
allow the x/tools Trybot to pass until dependency on types.Environment
can be removed.

Updates #47916

Change-Id: Iffd069ab0e8adebf4207c8f8891468a64d32b7cc
Reviewed-on: https://go-review.googlesource.com/c/go/+/353089
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>

4 files changed, 8 insertions, 8 deletions

diff --git a/src/cmd/compile/internal/noder/import.go b/src/cmd/compile/internal/noder/import.go
index f13f8ca7f5..f065c97763 100644
--- a/src/cmd/compile/internal/noder/import.go
+++ b/src/cmd/compile/internal/noder/import.go
@@ -43,12 +43,12 @@ var haveLegacyImports = false
 // for an imported package by overloading writeNewExportFunc, then
 // that payload will be mapped into memory and passed to
 // newReadImportFunc.
-var newReadImportFunc = func(data string, pkg1 *types.Pkg, env *types2.Environment, packages map[string]*types2.Package) (pkg2 *types2.Package, err error) {
+var newReadImportFunc = func(data string, pkg1 *types.Pkg, env *types2.Context, packages map[string]*types2.Package) (pkg2 *types2.Package, err error) {
 	panic("unexpected new export data payload")
 }
 
 type gcimports struct {
-	env      *types2.Environment
+	env      *types2.Context
 	packages map[string]*types2.Package
 }
 
@@ -224,7 +224,7 @@ func parseImportPath(pathLit *syntax.BasicLit) (string, error) {
 // readImportFile reads the import file for the given package path and
 // returns its types.Pkg representation. If packages is non-nil, the
 // types2.Package representation is also returned.
-func readImportFile(path string, target *ir.Package, env *types2.Environment, packages map[string]*types2.Package) (pkg1 *types.Pkg, pkg2 *types2.Package, err error) {
+func readImportFile(path string, target *ir.Package, env *types2.Context, packages map[string]*types2.Package) (pkg1 *types.Pkg, pkg2 *types2.Package, err error) {
 	path, err = resolveImportPath(path)
 	if err != nil {
 		return
diff --git a/src/cmd/compile/internal/noder/irgen.go b/src/cmd/compile/internal/noder/irgen.go
index c1a4f30f4a..6a09c2ee0c 100644
--- a/src/cmd/compile/internal/noder/irgen.go
+++ b/src/cmd/compile/internal/noder/irgen.go
@@ -34,13 +34,13 @@ func checkFiles(noders []*noder) (posMap, *types2.Package, *types2.Info) {
 	}
 
 	// typechecking
-	env := types2.NewEnvironment()
+	env := types2.NewContext()
 	importer := gcimports{
 		env:      env,
 		packages: map[string]*types2.Package{"unsafe": types2.Unsafe},
 	}
 	conf := types2.Config{
-		Environment:           env,
+		Context:               env,
 		GoVersion:             base.Flag.Lang,
 		IgnoreLabels:          true, // parser already checked via syntax.CheckBranches mode
 		CompilerErrorMessages: true, // use error strings matching existing compiler errors
diff --git a/src/cmd/compile/internal/noder/reader2.go b/src/cmd/compile/internal/noder/reader2.go
index dcd9a65f40..de7211305b 100644
--- a/src/cmd/compile/internal/noder/reader2.go
+++ b/src/cmd/compile/internal/noder/reader2.go
@@ -16,7 +16,7 @@ import (
 type pkgReader2 struct {
 	pkgDecoder
 
-	env     *types2.Environment
+	env     *types2.Context
 	imports map[string]*types2.Package
 
 	posBases []*syntax.PosBase
@@ -24,7 +24,7 @@ type pkgReader2 struct {
 	typs     []types2.Type
 }
 
-func readPackage2(env *types2.Environment, imports map[string]*types2.Package, input pkgDecoder) *types2.Package {
+func readPackage2(env *types2.Context, imports map[string]*types2.Package, input pkgDecoder) *types2.Package {
 	pr := pkgReader2{
 		pkgDecoder: input,
 
diff --git a/src/cmd/compile/internal/noder/unified.go b/src/cmd/compile/internal/noder/unified.go
index 3d4650a01f..ee76ff34af 100644
--- a/src/cmd/compile/internal/noder/unified.go
+++ b/src/cmd/compile/internal/noder/unified.go
@@ -78,7 +78,7 @@ func unified(noders []*noder) {
 		base.Errorf("cannot use -G and -d=quirksmode together")
 	}
 
-	newReadImportFunc = func(data string, pkg1 *types.Pkg, env *types2.Environment, packages map[string]*types2.Package) (pkg2 *types2.Package, err error) {
+	newReadImportFunc = func(data string, pkg1 *types.Pkg, env *types2.Context, packages map[string]*types2.Package) (pkg2 *types2.Package, err error) {
 		pr := newPkgDecoder(pkg1.Path, data)
 
 		// Read package descriptors for both types2 and compiler backend.