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error[E0029]: only `char` and numeric types are allowed in range patterns
  --> $DIR/E0029-teach.rs:7:9
   |
LL |         "hello" ..= "world" => {}
   |         -------^^^^^-------
   |         |           |
   |         |           this is of type `&'static str` but it should be `char` or numeric
   |         this is of type `&'static str` but it should be `char` or numeric
   |
   = note: In a match expression, only numbers and characters can be matched against a range. This is because the compiler checks that the range is non-empty at compile-time, and is unable to evaluate arbitrary comparison functions. If you want to capture values of an orderable type between two end-points, you can use a guard.

error: aborting due to previous error

For more information about this error, try `rustc --explain E0029`.