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Unreachable pattern error message could indicate why #39858

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#64592
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Unreachable pattern error message could indicate why#39858
#64592
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A-diagnosticsArea: Messages for errors, warnings, and lintsC-enhancementCategory: An issue proposing an enhancement or a PR with one.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.
@dragostis

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@dragostis
dragostis
opened on Feb 15, 2017

When compiling this crate on stable, there are no warnings, but on the latest nightly (15th of February), it finds this unreachable pattern which does not seem right:

warning: unreachable pattern
  --> src/token_stream.rs:47:21
   |
47 |                     Err(error) => Err(error)
   |                     ^^^^^^^^^^
   |
   = note: #[warn(unreachable_patterns)] on by default

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    A-diagnosticsArea: Messages for errors, warnings, and lintsC-enhancementCategory: An issue proposing an enhancement or a PR with one.T-compilerRelevant to the compiler team, which will review and decide on the PR/issue.

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