ast: allow scope var shadowing

vlib/v/ast/scope.v

@@ -106,18 +106,13 @@ pub fn (s mut Scope) register(name string, obj ScopeObject) {
 	if name == '_' {
 		return
 	}
-	if _ := s.find(name) {
+	if name in s.objects {
 		// println('existing obect: $name')
 		return
 	}
 	s.objects[name] = obj
 }
 
-pub fn (s mut Scope) register_force(name string, obj ScopeObject) {
-	s.objects[name] = obj
-}
-
-
 pub fn (s &Scope) outermost() &Scope {
 	mut sc := s
 	for !isnil(sc.parent) {

vlib/v/parser/if.v

@@ -140,11 +140,11 @@ fn (mut p Parser) match_expr() ast.MatchExpr {
 			if var_name != '' {
 				// Register a shadow variable with the actual type
 				// (this replaces the old `it`)
-				// TODO doesn't work right now
-				p.scope.register(var_name, ast.Var{
-					name: var_name
-					typ: typ.to_ptr()
-				})
+				// TODO doesn't work right now (fixed, uncomment when merging)
+				// p.scope.register(var_name, ast.Var{
+				// 	name: var_name
+				// 	typ: typ.to_ptr()
+				// })
 				// println(var_name)
 			}
 		} else {

vlib/v/parser/parser.v

@@ -757,8 +757,7 @@ fn (mut p Parser) index_expr(left ast.Expr) ast.IndexExpr {
 }
 
 fn (mut p Parser) scope_register_it() {
-    // force new 'it' even if it exists in parent scope
-	p.scope.register_force('it', ast.Var{
+	p.scope.register('it', ast.Var{
 		name: 'it'
 		pos: p.tok.position()
 		is_used: true