error: no rules expected the token `enum E {}` --> $DIR/nonterminal-matching.rs:19:10 | LL | macro n(a $nt_item b) { | --------------------- when calling this macro ... LL | n!(a $nt_item b); | ^^^^^^^^ no rules expected this token in macro call ... LL | complex_nonterminal!(enum E {}); | ------------------------------- in this macro invocation | = note: this error originates in the macro `complex_nonterminal` (in Nightly builds, run with -Z macro-backtrace for more info) error: aborting due to previous error