cl: toStructType check name redeclared

cl/func_type_and_var.go

@@ -209,15 +209,33 @@ func toStructType(ctx *blockCtx, v *ast.StructType) *types.Struct {
 	fieldList := v.Fields.List
 	fields := make([]*types.Var, 0, len(fieldList))
 	tags := make([]string, 0, len(fieldList))
+	names := make(map[string]token.Pos)
+	chkRedecl := func(name string, pos token.Pos) bool {
+		if opos, ok := names[name]; ok {
+			npos := ctx.Position(pos)
+			ctx.handleCodeErrorf(&npos, "%v redeclared\n\t%v other declaration of %v",
+				name, ctx.Position(opos), name)
+			return true
+		}
+		names[name] = pos
+		return false
+	}
 	for _, field := range fieldList {
 		typ := toType(ctx, field.Type)
 		if field.Names == nil { // embedded
-			fld := types.NewField(token.NoPos, pkg, getTypeName(typ), typ, true)
+			name := getTypeName(typ)
+			if chkRedecl(name, field.Type.Pos()) {
+				continue
+			}
+			fld := types.NewField(token.NoPos, pkg, name, typ, true)
 			fields = append(fields, fld)
 			tags = append(tags, toFieldTag(field.Tag))
 			continue
 		}
 		for _, name := range field.Names {
+			if chkRedecl(name.Name, name.NamePos) {
+				continue
+			}
 			fld := types.NewField(token.NoPos, pkg, name.Name, typ, false)
 			fields = append(fields, fld)
 			tags = append(tags, toFieldTag(field.Tag))