Provide more context on "not general enough" error

[estebank]

Point at the source bound that was unmet when a HRTB is unmet.

error: implementation of `TheTrait` is not general enough
  --> $DIR/associated-types-eq-hr.rs:96:5
   |
LL | fn tuple_one<T>()
   |    --------- due to a where-clause on `tuple_one`...
LL | where
LL |     T: for<'x, 'y> TheTrait<(&'x isize, &'y isize), A = &'x isize>,
   |        ----------------------------------------------------------- unsatisfied where-clause on `tuple_one`
...
LL |     tuple_one::<Tuple>();
   |     ^^^^^^^^^^^^^^^^^^^^
   |
   = note: ...`Tuple` must implement `TheTrait<(&'0 isize, &'1 isize)>`, for any two lifetimes `'0` and `'1`...
   = note: ...but it actually implements `TheTrait<(&'2 isize, &'2 isize)>`, for some specific lifetime `'2`

This increases the size of ConstraintCategory, which might be a perf regression.

[rustbot]

r? @mati865

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[estebank]

This needs a perf run.

[chenyukang]

@bors try @rust-timer queue

[rust-bors]

☀️ Try build successful (CI)
Build commit: c4ffd9d (c4ffd9d2a6d3ecf29ea25ad730a7e06b80944815)
Base parent: d287eb7 (d287eb7a292caa8abbe12051dce2ee707fe03200)

[rust-timer]

Finished benchmarking commit (c4ffd9d): comparison URL.

Overall result: ❌✅ regressions and improvements - no action needed

Benchmarking means the PR may be perf-sensitive. Consider adding rollup=never if this change is not fit for rolling up.

@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	0.3%	[0.2%, 0.3%]	6
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.6%	[-0.6%, -0.6%]	1
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

This perf run didn't have relevant results for this metric.

Cycles

This perf run didn't have relevant results for this metric.

Binary size

Results (primary -0.0%, secondary -0.0%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-0.0%	[-0.1%, -0.0%]	15
Improvements ✅ (secondary)	-0.0%	[-0.1%, -0.0%]	7
All ❌✅ (primary)	-0.0%	[-0.1%, -0.0%]	15

Bootstrap: 503.997s -> 499.936s (-0.81%)
Artifact size: 408.93 MiB -> 408.90 MiB (-0.01%)

[rustbot]

This PR was rebased onto a different main commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.