fix #1197

cl/compile_test.go

@@ -143,6 +143,19 @@ var x string = c.Str()
 `)
 }
 
+func TestUnderscoreRedeclared_Issue1197(t *testing.T) {
+	gopClTest(t, `
+func() (_ [2]int) { type _ int; return }()
+`, `package main
+
+func main() {
+	func() (_ [2]int) {
+		return
+	}()
+}
+`)
+}
+
 func TestInterfaceBugNilUnderlying_Issue1196(t *testing.T) {
 	gopClTest(t, `
 func main() {

cl/stmt.go

@@ -728,6 +728,9 @@ func compileDeclStmt(ctx *blockCtx, expr *ast.DeclStmt) {
 
 func compileType(ctx *blockCtx, t *ast.TypeSpec) {
 	name := t.Name.Name
+	if name == "_" {
+		return
+	}
 	if t.Assign != token.NoPos { // alias type
 		ctx.cb.AliasType(name, toType(ctx, t.Type))
 	} else {

cmd/goptestgo/goptestgo.go

@@ -82,6 +82,7 @@ var (
 		"issue18149.go":     {},
 		"issue22662.go":     {},
 		"issue27201.go":     {},
+		"issue46903.go":     {},
 		"nilptr_aix.go":     {},
 		"inline_literal.go": {},
 		"returntype.go":     {}, // not a problem