6
recursive: fix hang on fulfill by slightly smarter check for progress. by Dirbai...
source link: https://github.com/rust-lang/chalk/pull/752
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This fixes a hang using the recursive solver when trying to prove exists<'a, T> { if(T: 'a) { WellFormed(&'a T) } }.
Snippet of the log when looping
The issue is:
- it tries to prove
InEnvironment { environment: Env([for<> ?0: '?1]), goal: ?2: '?3 } - it gets "useless" substs
[?0 := ^0.0, ?1 := '^0.1] - it applies them, they cause nothing to change but it thinks they did
- so in next round it processes again the exact same obligation...
There was already an if treating empty substs as "useless", this extends it to treating trivial subs as "useless". (empty substs are also trivial).
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