Generalize dropck to ignore item-less traits #25113
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Fix rust-lang#24805 (see follow-on commit for test.)
Namely, we need to catch cases like `trait Child : Parent { }` where
`Parent` itself defines methods.
The new functionality being tested here is that a drop impl bounded by `UserDefined` does not cause dropck to inject its conservative constraints on region inference.
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r? @pcwalton (rust_highfive has picked a reviewer for you, use r? to override) |
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r? @huonw |
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Generalize dropck to ignore item-less traits
Fix #24805.
(This is the reopened + rebased version of PR #24898, which @huonw already reviewed.)