tree b21143b87edf2ca020bcfa464e98e99ae4848818
parent 8111706c18aebe273457b0967e076bf5e105a382
parent a15e0dc4991a6c06dd5108d72163fb9809db2b07
author Yuki Okushi <huyuumi.dev@gmail.com> 1604048454 +0900
committer GitHub <noreply@github.com> 1604048454 +0900
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Rollup merge of #78524 - tmiasko:source-files-borrow, r=Aaron1011

Avoid BorrowMutError with RUSTC_LOG=debug

```console
$ touch empty.rs
$ env RUSTC_LOG=debug rustc +stage1 --crate-type=lib empty.rs
```

Fails with a `BorrowMutError` because source map files are already
borrowed while `features_query` attempts to format a log message
containing a span.

Release the borrow before the query to avoid the issue.