Unreported internal error when matching array of U8

[junetried]

The following code causes ponyc to return Error: internal failure not reported:

actor Main
    new create(env: Env) =>
        let arr: Array[U8 val] = [4; 5]
        match arr
        | [2; 3] => env.out.print("two and three")
        | [4; 5] => env.out.print("four and five")
        else
            env.out.print("something else")
        end

This modified version instead (correctly) gives a compile error, because Array does not implement eq:

actor Main
    new create(env: Env) =>
        let arr: Array[U8 val] = [4; 5]
        match arr
        | [U8(2); U8(3)] => env.out.print("two and three")
        | [U8(4); U8(5)] => env.out.print("four and five")
        else
            env.out.print("something else")
        end

Reproduced on my machine using ponyc 0.58.0-a161b7c9 and on the playground with ponyc 0.58.6-41be76e.

[jemc]

The "internal failure not reported" message is shown when a compiler pass fails, but did not emit any errors explaining why it failed.

The right course of action here is for someone to troubleshoot (probably by running ponyc under a debugger like lldb or gdb) exactly where/why the pass is failing, and add code that emits an appropriate error for that.