`@errorCast` runtime safety does not include the name of the error

[nektro]

Zig Version

0.12.0

Steps to Reproduce and Observed Output

pub fn main() !void {
    const bar: error{Foo}!i32 = @errorCast(foo());
    _ = &bar;
}
fn foo() anyerror!i32 {
    return error.Bar;
}

thread 2814343 panic: invalid error code
/test.zig:2:47: 0x10335b4 in main (test)
    const bar: error{Foo}!i32 = @errorCast(foo());
                                              ^
/home/meghan/.local/share/zig/lib/std/start.zig:511:37: 0x1033504 in posixCallMainAndExit (test)
            const result = root.main() catch |err| {
                                    ^
/home/meghan/.local/share/zig/lib/std/start.zig:253:5: 0x1033041 in _start (test)
    asm volatile (switch (native_arch) {
    ^
???:?:?: 0x0 in ??? (???)
Aborted (core dumped)

Expected Output

thread 2814343 panic: invalid error cast: expected error{Foo}, found error.Bar

[amp-59]

This is added by #19764:

thread 3935 panic: cast to 'error{Foo}' from 'anyerror' error.Bar
/home/amp/.local/share/test/error_cast_error_name.zig:2:47: 0x1034c17 in main (error_cast_error_name)
    const bar: error{Foo}!i32 = @errorCast(foo());
                                              ^
/home/amp/.local/share/projects/all/zig/lib/zig/std/start.zig:524:37: 0x10349c5 in posixCallMainAndExit (error_cast_error_name)
            const result = root.main() catch |err| {
                                    ^
/home/amp/.local/share/projects/all/zig/lib/zig/std/start.zig:266:5: 0x10347c1 in _start (error_cast_error_name)
    asm volatile (switch (native_arch) {
    ^
???:?:?: 0x0 in ??? (???)
Aborted

[devraymondsh]

We need #19764 to be merged for this issue. Still waiting.