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add behavior test for bitcast packed struct twice

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closes #9914
This commit is contained in:
Andrew Kelley 2023-07-26 18:02:26 -07:00
parent 508294e9be
commit 9d3363fee9
1 changed files with 10 additions and 0 deletions
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10
test/behavior/packed-struct.zig
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@ -640,3 +640,13 @@ test "store undefined to packed result location" {
var s = packed struct { x: u4, y: u4 }{ .x = x, .y = if (x > 0) x else undefined }; var s = packed struct { x: u4, y: u4 }{ .x = x, .y = if (x > 0) x else undefined };
try expectEqual(x, s.x); try expectEqual(x, s.x);
} }
test "bitcast back and forth" {
// Originally reported at https://github.com/ziglang/zig/issues/9914
const S = packed struct { one: u6, two: u1 };
const s = S{ .one = 0b110101, .two = 0b1 };
const u: u7 = @bitCast(s);
const s2: S = @bitCast(u);
try expect(s.one == s2.one);
try expect(s.two == s2.two);
}