Commits on Nov 16, 2023

1. Handle attempts to have multiple cfgd tail expressions …

   When encountering code that seems like it might be trying to have
   multiple tail expressions depending on `cfg` information, suggest
   alternatives that will success to parse.
   
   ```rust
   fn foo() -> String {
       #[cfg(feature = "validation")]
       [1, 2, 3].iter().map(|c| c.to_string()).collect::<String>()
       #[cfg(not(feature = "validation"))]
       String::new()
   }
   ```
   
   ```
   error: expected `;`, found `#`
     --> $DIR/multiple-tail-expr-behind-cfg.rs:5:64
      |
   LL |     #[cfg(feature = "validation")]
      |     ------------------------------ only `;` terminated statements or tail expressions are allowed after this attribute
   LL |     [1, 2, 3].iter().map(|c| c.to_string()).collect::<String>()
      |                                                                ^ expected `;` here
   LL |     #[cfg(not(feature = "validation"))]
      |     - unexpected token
      |
   help: add `;` here
      |
   LL |     [1, 2, 3].iter().map(|c| c.to_string()).collect::<String>();
      |                                                                +
   help: alternatively, consider surrounding the expression with a block
      |
   LL |     { [1, 2, 3].iter().map(|c| c.to_string()).collect::<String>() }
      |     +                                                             +
   help: it seems like you are trying to provide different expressions depending on `cfg`, consider using `if cfg!(..)`
      |
   LL ~     if cfg!(feature = "validation") {
   LL ~         [1, 2, 3].iter().map(|c| c.to_string()).collect::<String>()
   LL ~     } else if cfg!(not(feature = "validation")) {
   LL ~         String::new()
   LL +     }
      |
   ```
   
   Fix rust-lang#106020.

   

   estebank committed Nov 16, 2023
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