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Auto merge of #103877 - oli-obk:const_eval_step_limit, r=fee1-dead

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Replace const eval limit by a lint and add an exponential backoff warning

The lint triggers at the first power of 2 that comes after 1 million function calls or traversed back-edges (takes less than a second on usual programs). After the first emission, an unsilenceable warning is repeated at every following power of 2 terminators, causing it to get reported less and less the longer the evaluation runs.

cc `@rust-lang/wg-const-eval`

fixes #93481
closes #67217
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bors
2023-06-01 05:32:00 +00:00
parent ba1690bedd 05eae08233
commit 23f93a1266
41 changed files with 325 additions and 261 deletions
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2
compiler/rustc_feature/src/active.rs
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@@ -351,8 +351,6 @@ declare_features! (
(active, const_async_blocks, "1.53.0", Some(85368), None),
/// Allows `const || {}` closures in const contexts.
(incomplete, const_closures, "1.68.0", Some(106003), None),
/// Allows limiting the evaluation steps of const expressions
(active, const_eval_limit, "1.43.0", Some(67217), None),
/// Allows the definition of `const extern fn` and `const unsafe extern fn`.
(active, const_extern_fn, "1.40.0", Some(64926), None),
/// Allows basic arithmetic on floating point types in a `const fn`.