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This commit is intended to follow the stabilization disposition of the
FCP that has now finished in #84223. This stabilizes the ability to flag
thread local initializers as `const` expressions which enables the macro
to generate more efficient code for accessing it, notably removing
runtime checks for initialization.
More information can also be found in #84223 as well as the tests where
the feature usage was removed in this PR.
Closes #84223
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This reduces codegen for rustc_query_impl by 169k lines of LLVM IR, representing
a 1.2% improvement.
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Add rustc lint, warning when iterating over hashmaps
r? rust-lang/wg-incr-comp
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This performs a substitution of code following the pattern:
let <id> = if let <pat> = ... { identity } else { ... : ! };
To simplify it to:
let <pat> = ... { identity } else { ... : ! };
By adopting the let_else feature.
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When an incremental fingerprint mismatch occurs, we debug-print
our `DepNode` and query result. Unfortunately, the debug printing
process may cause us to run additional queries, which can result
in a re-entrant fingerprint mismatch error.
To avoid a double panic, this commit adds a thread-local variable
to detect re-entrant calls.
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Implementations in stdlib are now optimized as they were before.
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