Compiler assertion failure when assigning to nullable frame variable

[adrusi]

Found what looks like a compiler bug.

compiler_error.zig:

fn a() void {
    suspend;
}

pub fn main() void {
    var frame: ?@Frame(a) = async a();
}

$ zig version                   
0.6.0+e7207bc26
$ zig run compiler_error.zig 
when analyzing /home/adrusi/posh/src/compiler_error.zig:6:29 in compiler source at /deps/zig/src/codegen.cpp:1811: assertion failed. This is a bug in the Zig compiler.
Unable to dump stack trace: debug info stripped
zsh: abort      ~/zig-linux-x86_64-0.6.0+e7207bc26/zig run src/compiler_error.zig