error: expected expression, found keyword `extern`
  --> $DIR/reparse-expr-issue-139495.rs:2:24
   |
LL |   ($abi: literal) => { extern $abi }
   |                        ^^^^^^ expected expression
...
LL |     m1!(-2)
   |     ------- in this macro invocation
   |
   = note: this error originates in the macro `m1` (in Nightly builds, run with -Z macro-backtrace for more info)

error: expected expression, found keyword `extern`
  --> $DIR/reparse-expr-issue-139495.rs:6:21
   |
LL |   ($abi: expr) => { extern $abi }
   |                     ^^^^^^ expected expression
...
LL |     m2!(-2)
   |     ------- in this macro invocation
   |
   = note: this error originates in the macro `m2` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 2 previous errors