Commits on Jul 18, 2022

1. Use span_bug for unexpected field projection type …

   Improves the compiler error backtrace information, as shown in rust-lang#99363,
   by using `span_bug` instead of `bug`.
   
   New output:
   
   ```
   build/aarch64-apple-darwin/stage1/bin/rustc /tmp/test.rs --edition=2021
   error: internal compiler error: compiler/rustc_middle/src/ty/closure.rs:185:25: Unexpected type Opaque(DefId(0:5 ~ test[db0f]::main::T::{opaque#0}), []) for `Field` projection
     --> /tmp/test.rs:11:27
      |
   11 |         let Foo((a, b)) = foo;
      |                           ^^^
   
   thread 'rustc' panicked at 'Box<dyn Any>', /Users/jmq/src/forked/rust/compiler/rustc_errors/src/lib.rs:1331:9
   stack backtrace:
   ```
   
   (Remainder of output truncated.)

   Jordan McQueen authored and Jordan McQueen committed Jul 18, 2022
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