zig/test/cases/defer.zig
Jimmi Holst Christensen 378d3e4403
Solve the return type ambiguity (#1628)
Changed container and initializer syntax
* <container> { ... } -> <container> . { ... }
* <exrp> { ... } -> <expr> . { ...}
2018-10-15 09:51:15 -04:00

79 lines
1.6 KiB
Zig

const assert = @import("std").debug.assert;
var result: [3]u8 = undefined;
var index: usize = undefined;
fn runSomeErrorDefers(x: bool) !bool {
index = 0;
defer {
result[index] = 'a';
index += 1;
}
errdefer {
result[index] = 'b';
index += 1;
}
defer {
result[index] = 'c';
index += 1;
}
return if (x) x else error.FalseNotAllowed;
}
test "mixing normal and error defers" {
assert(runSomeErrorDefers(true) catch unreachable);
assert(result[0] == 'c');
assert(result[1] == 'a');
const ok = runSomeErrorDefers(false) catch |err| x: {
assert(err == error.FalseNotAllowed);
break :x true;
};
assert(ok);
assert(result[0] == 'c');
assert(result[1] == 'b');
assert(result[2] == 'a');
}
test "break and continue inside loop inside defer expression" {
testBreakContInDefer(10);
comptime testBreakContInDefer(10);
}
fn testBreakContInDefer(x: usize) void {
defer {
var i: usize = 0;
while (i < x) : (i += 1) {
if (i < 5) continue;
if (i == 5) break;
}
assert(i == 5);
}
}
test "defer and labeled break" {
var i = usize(0);
blk: {
defer i += 1;
break :blk;
}
assert(i == 1);
}
test "errdefer does not apply to fn inside fn" {
if (testNestedFnErrDefer()) |_| @panic("expected error") else |e| assert(e == error.Bad);
}
fn testNestedFnErrDefer() error!void {
var a: i32 = 0;
errdefer a += 1;
const S = struct.{
fn baz() error {
return error.Bad;
}
};
return S.baz();
}