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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
This commit is contained in:
bors 2023-06-01 05:32:00 +00:00
commit 23f93a1266
41 changed files with 325 additions and 261 deletions
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compiler/rustc_session/src/session.rs
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@ -128,8 +128,6 @@ pub struct Limits {
pub move_size_limit: Limit,
/// The maximum length of types during monomorphization.
pub type_length_limit: Limit,
/// The maximum blocks a const expression can evaluate.
pub const_eval_limit: Limit,
}
pub struct CompilerIO {