Open Wandalen opened 2 years ago
The error seems to come from https://github.com/lukaslueg/macro_railroad/blob/9941de799eb0c2cc067351551ee67cce6b65a2fd/src/parser.rs#L252 The problem is probably that the pat_param
fragment specifier of $pattern:pat_param
isn't supported yet by macro_railroad. The fix would be to add a PatParam
variant to the Fragment
enum and then parse pat_param
to this variant I think. pat_param
was introduced in the rust 2021 edition. The latest commit to macro_railroad was from 2020.
Yes, this is because the parser does not recognize or-patterns
as defined in the 2021 editions. We need two things, at least:
or_patterns
/ $pat_param
.2018
we do not parse pat_param
.The parser needs to be expanded here to add the PatParam
, an appropriate lowering here (if needed), and - if a new lowering-pattern was added - a rule how to draw the pattern based on railroad
here. We need test cases for the parser's behavior in all cases four cases (2018
, 2021
, pat_param
, pat
).
Hi! Thanks, but does not work on my Firefox.