REPL panics on parse errors in transitively imported files

[vkleen]

With two files like so:

# foo.ncl
import "bar.ncl"

# bar.ncl
{

that is, foo.ncl immediately imports bar.ncl and bar.ncl contains a parse error, the REPL panics on importing foo.ncl:

nickel> import "foo.ncl"
thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Error(ParseErrors(ParseErrors { errors: [UnexpectedEOF(FileId(6), ["\"!\"", "\"\\\"\"", "\"'\\\"\"", "\"(\"", "\"-\"", "\"Array\"", "\"Bool\"", "\"Dyn\"", "\"Number\"", "\"String\"", "\"[\"", "\"[|\"", "\"_\"", "\"array_lazy_assume\"", "\"array_slice\"", "\"assume\"", "\"blame\"", "\"chng_pol\"", "\"deep_seq\"", "\"deserialize\"", "\"dualize\"", "\"elem_at\"", "\"embed\"", "\"enum_from\"", "\"false\"", "\"fields\"", "\"forall\"", "\"fun\"", "\"generate\"", "\"go_array\"", "\"go_codom\"", "\"go_dict\"", "\"go_dom\"", "\"go_field\"", "\"has_field\"", "\"hash\"", "\"identifier\"", "\"if\"", "\"import\"", "\"insert_type_variable\"", "\"label_append_note\"", "\"label_push_diag\"", "\"label_with_message\"", "\"label_with_notes\"", "\"length\"", "\"let\"", "\"lookup_type_variable\"", "\"m%\\\"\"", "\"map\"", "\"match\"", "\"null\"", "\"num literal\"", "\"num_from\"", "\"op force\"", "\"polarity\"", "\"pow\"", "\"raw enum tag\"", "\"rec_default_op\"", "\"rec_force_op\"", "\"record_empty_with_tail\"", "\"record_insert\"", "\"record_lazy_assume\"", "\"record_map\"", "\"record_remove\"", "\"record_seal_tail\"", "\"record_unseal_tail\"", "\"seal\"", "\"seq\"", "\"serialize\"", "\"str_chars\"", "\"str_contains\"", "\"str_find\"", "\"str_from\"", "\"str_is_match\"", "\"str_length\"", "\"str_lowercase\"", "\"str_replace\"", "\"str_replace_regex\"", "\"str_split\"", "\"str_substr\"", "\"str_trim\"", "\"str_uppercase\"", "\"symbolic string start\"", "\"trace\"", "\"true\"", "\"typeof\"", "\"unseal\"", "\"values\"", "\"{\""])] }, Original(RawSpan { src_id: FileId(5), start: ByteIndex(0), end: ByteIndex(16) })))', core/src/repl/mod.rs:116:64

The error message points at the unwrap() call at core/src/repl/mod.rs:116:64. This panic doesn't happen when trying to evaluate foo.ncl from the CLI, or in fact when trying another file that imports foo.ncl.

[Radvendii]

closed in #1474