error: no rules expected item `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: while trying to match item `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: no rules expected expression `3`
  --> $DIR/nonterminal-matching.rs:32:35
   |
LL |     (expr $x:expr) => { bar!(expr $x); };
   |                                   ^^ no rules expected this token in macro call
...
LL | macro_rules! bar {
   | ---------------- when calling this macro
...
LL | foo!(expr 3);
   | ------------ in this macro invocation
   |
note: while trying to match `3`
  --> $DIR/nonterminal-matching.rs:42:11
   |
LL |     (expr 3) => {};
   |           ^
   = 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 `foo` (in Nightly builds, run with -Z macro-backtrace for more info)

error: no rules expected literal `4`
  --> $DIR/nonterminal-matching.rs:33:44
   |
LL |     (literal $x:literal) => { bar!(literal $x); };
   |                                            ^^ no rules expected this token in macro call
...
LL | macro_rules! bar {
   | ---------------- when calling this macro
...
LL | foo!(literal 4);
   | --------------- in this macro invocation
   |
note: while trying to match `4`
  --> $DIR/nonterminal-matching.rs:43:14
   |
LL |     (literal 4) => {};
   |              ^
   = 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 `foo` (in Nightly builds, run with -Z macro-backtrace for more info)

error: no rules expected path `a::b::c`
  --> $DIR/nonterminal-matching.rs:34:35
   |
LL |     (path $x:path) => { bar!(path $x); };
   |                                   ^^ no rules expected this token in macro call
...
LL | macro_rules! bar {
   | ---------------- when calling this macro
...
LL | foo!(path a::b::c);
   | ------------------ in this macro invocation
   |
note: while trying to match `a`
  --> $DIR/nonterminal-matching.rs:44:11
   |
LL |     (path a::b::c) => {};
   |           ^
   = 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 `foo` (in Nightly builds, run with -Z macro-backtrace for more info)

error: no rules expected statement `let abc = 0`
  --> $DIR/nonterminal-matching.rs:35:35
   |
LL |     (stmt $x:stmt) => { bar!(stmt $x); };
   |                                   ^^ no rules expected this token in macro call
...
LL | macro_rules! bar {
   | ---------------- when calling this macro
...
LL | foo!(stmt let abc = 0);
   | ---------------------- in this macro invocation
   |
note: while trying to match keyword `let`
  --> $DIR/nonterminal-matching.rs:45:11
   |
LL |     (stmt let abc = 0) => {};
   |           ^^^
   = 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 `foo` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 5 previous errors