error: missing condition for `if` expression
  --> $DIR/issue-68091-unicode-ident-after-if.rs:3:13
   |
LL |         $($c)ö* {}
   |             ^   - if this block is the condition of the `if` expression, then it must be followed by another block
   |             |
   |             expected condition here
...
LL |     x!(if);
   |     ------ in this macro invocation
   |
   = note: this error originates in the macro `x` (in Nightly builds, run with -Z macro-backtrace for more info)

error: aborting due to 1 previous error