cgen: fix missing cast if fixed array is surrounded in brackets (fix #25629) (#25741)

Author: dy-tea

vlib/builtin/array_test.v

@@ -806,6 +806,11 @@ fn test_fixed_array_literal_eq() {
 
 	assert [[1, 1]!, [2, 2]!] == [[1, 1]!, [2, 2]!]
 	assert [[1, 1]!, [2, 2]!] != [[1, 2]!, [2, 3]!]
+
+	// vfmt off
+	assert ([1, 2, 3]!) == [1, 2, 3]!
+	assert (([1, 2, 3]!)) == [1, 2, 3]!
+	// vfmt on
 }
 
 fn test_sort() {

vlib/v/gen/c/assign.v

@@ -474,6 +474,13 @@ fn (mut g Gen) assign_stmt(node_ ast.AssignStmt) {
 				is_fixed_array_init = val.is_fixed
 				has_val = val.has_val
 			}
+			ast.ParExpr {
+				if val.expr is ast.ArrayInit {
+					array_init := val.expr as ast.ArrayInit
+					is_fixed_array_init = array_init.is_fixed
+					has_val = array_init.has_val
+				}
+			}
 			ast.CallExpr {
 				is_call = true
 				if val.comptime_ret_val {
@@ -1026,6 +1033,19 @@ fn (mut g Gen) assign_stmt(node_ ast.AssignStmt) {
 							} else {
 								g.array_init(val, cvar_name)
 							}
+						} else if val is ast.ParExpr && val.expr is ast.ArrayInit {
+							array_init := val.expr as ast.ArrayInit
+							cvar_name := c_name(ident.name)
+							if array_init.is_fixed && ident.name in g.defer_vars {
+								g.go_before_last_stmt()
+								g.empty_line = true
+								g.write('memcpy(${cvar_name}, ')
+								g.write('(${styp})')
+								g.array_init(array_init, cvar_name)
+								g.write(', sizeof(${styp}))')
+							} else {
+								g.array_init(array_init, cvar_name)
+							}
 						} else if val_type.has_flag(.shared_f) {
 							g.expr_with_cast(val, val_type, var_type)
 						} else if val in [ast.MatchExpr, ast.IfExpr]

vlib/v/gen/c/cgen.v

@@ -3895,7 +3895,12 @@ fn (mut g Gen) expr(node_ ast.Expr) {
 		}
 		ast.ParExpr {
 			g.write('(')
-			g.expr(node.expr)
+			if node.expr is ast.ArrayInit && node.expr.is_fixed && !g.inside_assign {
+				array_init := node.expr as ast.ArrayInit
+				g.fixed_array_init_with_cast(array_init, array_init.typ)
+			} else {
+				g.expr(node.expr)
+			}
 			g.write(')')
 		}
 		ast.PostfixExpr {