compiler crashes when it sees `===`

[bobzhang]

• desired behavior: fails gracefully

git/core$moon test
failed: moonc build-package /Users/hongbozhang/git/core/builtin/iter.mbt /Users/hongbozhang/git/core/builtin/debug.mbt /Users/hongbozhang/git/core/builtin/unit.mbt /Users/hongbozhang/git/core/builtin/list.mbt /Users/hongbozhang/git/core/builtin/result.mbt /Users/hongbozhang/git/core/builtin/array.mbt /Users/hongbozhang/git/core/builtin/option.mbt /Users/hongbozhang/git/core/builtin/fixedarray.mbt /Users/hongbozhang/git/core/builtin/traits.mbt /Users/hongbozhang/git/core/builtin/intrinsics.mbt /Users/hongbozhang/git/core/builtin/arrayview.mbt /Users/hongbozhang/git/core/builtin/autoloc.mbt /Users/hongbozhang/git/core/builtin/buffer.mbt /Users/hongbozhang/git/core/builtin/bytes.mbt /Users/hongbozhang/git/core/builtin/console.mbt /Users/hongbozhang/git/core/builtin/linkedhashmap.mbt /Users/hongbozhang/git/core/builtin/byte.mbt /Users/hongbozhang/git/core/builtin/intrinsics_test.mbt /Users/hongbozhang/git/core/builtin/iter_test.mbt /Users/hongbozhang/git/core/builtin/linkedhashmap_test.mbt /Users/hongbozhang/git/core/target/wasm-gc/debug/test/builtin/__generated_driver_for_underscore_test.mbt -o /Users/hongbozhang/git/core/target/wasm-gc/debug/test/builtin/builtin.underscore_test.core -pkg moonbitlang/core/builtin -is-main -i /Users/hongbozhang/git/core/target/wasm-gc/debug/test/assertion/assertion.mi:assertion -i /Users/hongbozhang/git/core/target/wasm-gc/debug/test/char/char.mi:char -i /Users/hongbozhang/git/core/target/wasm-gc/debug/test/string/string.mi:string -i /Users/hongbozhang/git/core/target/wasm-gc/debug/test/int/int.mi:int -i /Users/hongbozhang/git/core/target/wasm-gc/debug/test/tuple/tuple.mi:tuple -pkg-sources moonbitlang/core/builtin:/Users/hongbozhang/git/core/builtin -g
Fatal error: exception Basic_hash_string.Key_not_found("===")
error: failed at test stage