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add compile-error test: bitcast

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Issue fixed by an unknown commit.

closes #3818
This commit is contained in:
Michael Dusan 2020-04-01 11:02:38 -04:00 committed by Andrew Kelley
parent 4848b28ec8
commit f6d384450f
1 changed files with 15 additions and 0 deletions
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15
test/compile_errors.zig
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@ -6842,4 +6842,19 @@ pub fn addCases(cases: *tests.CompileErrorContext) void {
"tmp.zig:8:23: error: use of undefined value here causes undefined behavior",
"tmp.zig:14:23: error: use of undefined value here causes undefined behavior",
});
cases.add("issue #3818: bitcast from parray/slice to u16",
\\export fn foo1() void {
\\ var bytes = [_]u8{1, 2};
\\ const word: u16 = @bitCast(u16, bytes[0..]);
\\}
\\export fn foo2() void {
\\ var bytes: []u8 = &[_]u8{1, 2};
\\ const word: u16 = @bitCast(u16, bytes);
\\}
, &[_][]const u8{
"tmp.zig:3:42: error: unable to @bitCast from pointer type '*[2]u8'",
"tmp.zig:7:32: error: destination type 'u16' has size 2 but source type '[]u8' has size 16",
"tmp.zig:7:37: note: referenced here",
});
}