v2: ParExpr; mut var decl

vlib/v/ast/ast.v

@@ -11,7 +11,7 @@ import (
 pub type Expr = InfixExpr | IfExpr | StringLiteral | IntegerLiteral | CharLiteral | 	
 FloatLiteral | Ident | CallExpr | BoolLiteral | StructInit | ArrayInit | SelectorExpr | PostfixExpr | 	
 AssignExpr | PrefixExpr | MethodCallExpr | IndexExpr | RangeExpr | MatchExpr | 	
-CastExpr | EnumVal | Assoc | SizeOf | None | MapInit | OrExpr
+CastExpr | EnumVal | Assoc | SizeOf | None | MapInit | OrExpr | ParExpr
 
 pub type Stmt = VarDecl | GlobalDecl | FnDecl | Return | Module | Import | ExprStmt | 	
 ForStmt | StructDecl | ForCStmt | ForInStmt | CompIf | ConstDecl | Attr | BranchStmt | 	
@@ -433,6 +433,12 @@ pub:
 	stmts []Stmt
 }
 
+// `(3+4)`
+pub struct ParExpr {
+pub:
+	expr Expr
+}
+
 pub struct AssignExpr {
 pub:
 	op   token.Kind

vlib/v/fmt/fmt.v

@@ -101,6 +101,9 @@ fn (f mut Fmt) stmt(node ast.Stmt) {
 	match node {
 		ast.AssignStmt {
 			for i, left in it.left {
+				if left.var_info().is_mut {
+					f.write('mut ')
+				}
 				f.expr(left)
 				if i < it.left.len - 1 {
 					f.write(', ')
@@ -426,6 +429,11 @@ fn (f mut Fmt) expr(node ast.Expr) {
 			f.write(it.var_name + ' := ')
 			f.expr(it.expr)
 		}
+		ast.ParExpr{
+			f.write('(')
+			f.expr(it.expr)
+			f.write(')')
+			}
 		ast.PostfixExpr {
 			f.expr(it.expr)
 			f.write(it.op.str())

vlib/v/parser/parser.v

@@ -684,6 +684,9 @@ pub fn (p mut Parser) expr(precedence int) (ast.Expr,table.Type) {
 			p.check(.lpar)
 			node,typ = p.expr(0)
 			p.check(.rpar)
+			node = ast.ParExpr{
+				expr: node
+			}
 		}
 		.key_if {
 			node = p.if_expr()