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error: no rules expected the token `enum E {}`
--> $DIR/nonterminal-matching.rs:19:10
|
LL | macro complex_nonterminal($nt_item: item) {
| --------------
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: while trying to match `enum E {}`
--> $DIR/nonterminal-matching.rs:15:15
|
LL | macro n(a $nt_item b) {
| ^^^^^^^^
...
LL | complex_nonterminal!(enum E {});
| ------------------------------- in this macro invocation
= note: captured metavariables except for `:tt`, `:ident` and `:lifetime` cannot be compared to other tokens
= note: see <https://doc.rust-lang.org/nightly/reference/macros-by-example.html#forwarding-a-matched-fragment> for more information
= help: try using `:tt` instead in the macro definition
= note: this error originates in the macro `complex_nonterminal` (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to 1 previous error
|
