error: expected identifier, found keyword `if`
  --> $DIR/keyword-if-as-identifier.rs:4:9
   |
LL |     let if = "foo";
   |         ^^ expected identifier, found keyword
   |
help: escape `if` to use it as an identifier
   |
LL |     let r#if = "foo";
   |         ++

error: aborting due to 1 previous error