error[E0531]: cannot find tuple struct/variant `x` in this scope
  --> $DIR/issue-5927.rs:14:9
   |
LL |         x(1) => x(1) //~ ERROR cannot find tuple struct/variant `x` in this scope
   |         ^ not found in this scope

error[E0425]: cannot find function `x` in this scope
  --> $DIR/issue-5927.rs:14:17
   |
LL |         x(1) => x(1) //~ ERROR cannot find tuple struct/variant `x` in this scope
   |                 ^ not found in this scope

error: aborting due to 2 previous errors

Some errors occurred: E0425, E0531.
For more information about an error, try `rustc --explain E0425`.