autofree: handle break

vlib/v/gen/cgen.v

@@ -847,7 +847,7 @@ fn (mut g Gen) stmt(node ast.Stmt) {
 		}
 		ast.BranchStmt {
 			g.write_v_source_line_info(node.pos)
-			if node.label.len > 0 {
+			if node.label != '' {
 				if node.kind == .key_break {
 					g.writeln('goto ${node.label}__break;')
 				} else {
@@ -856,6 +856,10 @@ fn (mut g Gen) stmt(node ast.Stmt) {
 				}
 			} else {
 				// continue or break
+				if g.pref.autofree && !g.is_builtin_mod {
+					g.writeln('// free before continue/break')
+					g.autofree_scope_vars(node.pos.pos - 1, node.pos.line_nr, false)
+				}
 				g.writeln('$node.kind;')
 			}
 		}

vlib/v/tests/valgrind/1.strings_and_arrays.v

@@ -256,10 +256,31 @@ fn free_before_break() {
 	s := 'a' + 'b'
 	for {
 		q := [1, 2, 3]
+		break
+	}
+	/*
+	for {
+		qq := [1, 2, 3]
 		if true {
+			// breaking should free only vars in the closest for loop's scope
+			// `qq`, not `s`
 			break
 		}
 	}
+	*/
+	/*
+	mut i := 0
+	for {
+		i++
+		qq := [1, 2, 3]
+		if i > 10 {
+			break
+		}
+		if true {
+			continue
+		}
+	}
+	*/
 }
 
 struct User {
@@ -315,7 +336,7 @@ fn main() {
 	comp_if()
 	free_before_return()
 	free_before_return_bool()
-	// free_before_break()
+	free_before_break()
 	// free_map()
 	// loop_map()
 	// free_array_except_returned_element()