[WIP] resolve: Make ambiguity checking stricter

[petrochenkov]

Testing a possible proper fix for the RustEmbed issue (#147196).
cc @LorrensP-2158466

[rustbot]

r? @jackh726

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[petrochenkov]

@bors try

[rust-bors]

💔 Test for 0e7f93c failed: CI. Failed jobs:

• try - dist-x86_64-linux (web logs, extended logs)

[petrochenkov]

@bors try

[rust-bors]

☀️ Try build successful (CI)
Build commit: 724e787 (724e78794d2cf06eef820a24c9a4608d63435e1d, parent: 2c0f4860cc86e2354a55ea04e738848168435c90)

[petrochenkov]

@craterbot check

[craterbot]

👌 Experiment pr-149145 created and queued.
🤖 Automatically detected try build 724e787
🔍 You can check out the queue and this experiment's details.

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

[craterbot]

🚧 Experiment pr-149145 is now running

ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

[craterbot]

🎉 Experiment pr-149145 is completed!
📊 1725 regressed and 8 fixed (741156 total)
📊 1997 spurious results on the retry-regessed-list.txt, consider a retry¹ if this is a significant amount.
📰 Open the summary report.

⚠️ If you notice any spurious failure please add them to the denylist!
ℹ️ Crater is a tool to run experiments across parts of the Rust ecosystem. Learn more

Footnotes

1. re-run the experiment with crates=https://crater-reports.s3.amazonaws.com/pr-149145/retry-regressed-list.txt ↩

[bors]

☔ The latest upstream changes (presumably #149462) made this pull request unmergeable. Please resolve the merge conflicts.

[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.

[petrochenkov]

Closing in favor of #149596.