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AstGen: ensure lableld block implicitly ends in a break

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This commit is contained in:
Veikka Tuominen 2022-03-09 17:12:40 +02:00
parent bb1fa0bdbd
commit 01b454f851
2 changed files with 10 additions and 0 deletions
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3
src/AstGen.zig
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@ -1991,6 +1991,9 @@ fn labeledBlockExpr(
defer block_scope.labeled_breaks.deinit(astgen.gpa);
try blockExprStmts(&block_scope, &block_scope.base, statements);
if (!block_scope.endsWithNoReturn()) {
_ = try block_scope.addBreak(.break_inline, block_inst, .void_value);
}
if (!block_scope.label.?.used) {
try astgen.appendErrorTok(label_token, "unused block label", .{});

7
test/behavior/basic.zig
View File

@ -846,3 +846,10 @@ test "discarding the result of various expressions" {
_ = while (S.bar()) |some| break some else {};
_ = for ("foo") |char| break char else {};
}
test "labeled block implicitly ends in a break" {
var a = false;
blk: {
if (a) break :blk;
}
}