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Rollup merge of #113296 - BoxyUwU:proof_trees_on_error, r=lcnr
add flag for enabling global cache usage for proof trees and printing proof trees on error This adds a few new things: - `-Zdump-solver-proof-tree=always/never/on-error` - `always`/`never` were previosuly specifiable by whether the flag exists or not, th new flag is `on_error` which reruns obligations of fulfillment and selection errors with proof tree generation enabled and prints them out - `-Zdump-solver-proof-tree-uses-cache` - allows forcing global cache to be used or unused for all generated proof trees, global cache is enabled by default for `always` so that it accurately represents what happend. This flag currently would affect misc uses of `GenerateProofTree::Yes` which will be added in the future for things like diagnostics logic and rustdoc's auto_trait file. We can fix this when we start using proof tree generation for those use cases if it's desirable. I also changed the output to go straight to stdout instead of going through `debug!` so that `-Zdump-solver-proof-tree` can be adequately used on `nightly` not just a locally built toolchain. The idea for `on-error` is that it should hopefully make it easier to quickly figure out "why doesnt this code compile"- you just pass in `-Zdump-solver-proof-tree=on-error` and you'll only get proof trees you care about. --- r? `@lcnr` `@compiler-errors`
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