fixes #115497

[surechen]

fixes #115497
Hi, thank you for reading this. I am not familiar with generics, especially in the case of HRTB mixing with WherePredict , I'm not sure if my method is correct. But I have noticed that this issue has been there for three weeks now and I am very eager to help solve this panic problem.

After multiple attempts, the compiler did pass the tests without any panic, so I submitted this PR for reviewer's advice. The edited code is mainly used to prevent panic in report diagnostic. I have added comments to the code regarding the changes made.

[rustbot]

r? @compiler-errors

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[rust-log-analyzer]

The job mingw-check failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

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---
    Checking rustc_mir_build v0.0.0 (/checkout/compiler/rustc_mir_build)
error: unused variable: `parent_hir_id`
   --> compiler/rustc_hir_analysis/src/collect/generics_of.rs:100:37
    |
100 | ...                   hir_id: parent_hir_id,
    |                               ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_parent_hir_id`
    = note: `-D unused-variables` implied by `-D warnings`

error: unused variable: `ty_info`
   --> compiler/rustc_hir_analysis/src/collect/generics_of.rs:102:37
   --> compiler/rustc_hir_analysis/src/collect/generics_of.rs:102:37
    |
102 | ...                   ty: ty_info,
    |                           ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_ty_info`

error: unused variable: `ty`
   --> compiler/rustc_hir_analysis/src/collect/resolve_bound_vars.rs:983:39
    |
983 |             GenericParamKind::Const { ty, default: Some(default) } => {
    |                                       ^^ help: try ignoring the field: `ty: _`
    Checking rustc_const_eval v0.0.0 (/checkout/compiler/rustc_const_eval)
error: could not compile `rustc_hir_analysis` (lib) due to 3 previous errors
warning: build failed, waiting for other jobs to finish...
Build completed unsuccessfully in 0:01:25

[compiler-errors]

Can you explain:

1. Why does this ICE occur?
2. What is this PR doing that makes it not occur?
3. Why is it correct?

[surechen]

Can you explain:

1. Why does this ICE occur?
2. What is this PR doing that makes it not occur?
3. Why is it correct?

Thank you for your reply. Previously, I only tested the use cases under test/ui. I just found that there are other test that have not passed. I will close this PR first and submit it after confirming that all the problems is really resolved.