Module rustc_expand::mbe::transcribe

Structs§

Frame 🔒
An iterator over the token trees in a delimited token tree ({ ... }) or a sequence ($(...)).
LockstepIterSize 🔒
An accumulator over a TokenTree to be used with fold. During transcription, we need to make sure that the size of each sequence and all of its nested sequences are the same as the sizes of all the matched (nested) sequences in the macro invocation. If they don’t match, somebody has made a mistake (either the macro writer or caller).

count_repetitions 🔒
Used solely by the count meta-variable expression, counts the outer-most repetitions at a given optional nested depth.
lockstep_iter_size 🔒
Given a tree, make sure that all sequences have the same length as the matches for the appropriate meta-vars in interpolations.
lookup_cur_matched 🔒
Lookup the meta-var named ident and return the matched token tree from the invocation using the set of matches interpolations.
matched_from_ident 🔒
Returns a NamedMatch item declared on the LHS given an arbitrary Ident
maybe_use_metavar_location 🔒
Usually metavariables $var produce interpolated tokens, which have an additional place for keeping both the original span and the metavariable span. For tt metavariables that’s not the case however, and there’s no place for keeping a second span. So we try to give the single produced span a location that would be most useful in practice (the hygiene part of the span must not be changed).
out_of_bounds_err 🔒
Used by meta-variable expressions when an user input is out of the actual declared bounds. For example, index(999999) in an repetition of only three elements.
transcribe 🔒
This can do Macro-By-Example transcription.
transcribe_metavar_expr 🔒