parser: Error for invalid match patterns is not clear/actionable

[cg-jl]

The parser fails with expected '=>' after pattern case if a case is a byte literal:

function main() {
  match b'.' {
    b';' => 0
    else => 1
  }
}

[alimpfard]

Match only accepts values as (expr) =>, right now only variant names are allowed without parenthesis:

function main() {
  match b'.' {
    (b';') => 0
    else => 1
  }
}

[cg-jl]

oh okay, thank you. Should we leave this or close this?

[alimpfard]

The error should be more clear at the very least, and the syntax is still fairly experimental (like most of the language :P), so we can leave the issue open for "improve error message"

[cg-jl]

Since https://github.com/SerenityOS/jakt/commit/b0b7bddf6015319342418b43dd9c3ad3ce5102bd bare literals are accepted, so looks like this is not an issue anymore