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Rollup of 4 pull requests #64461
This can cause cycles as `ConstProp` uses `layout_of` which, for generators, uses `optimized_mir` which runs `ConstProp`.
Unfortunately, the diagnotic machinery does not cope well with an empty span which can happen if the crate is empty, in which case we merely set a spanless note.
Provide a span if main function is not present in crate Unfortunately, the diagnostic machinery does not cope well with an empty span which can happen if the crate is empty, in which case we merely set a spanless note. Tests are already updated for this change, so a dedicated test is not added. Resolves #36561.
bors added a commit that referenced this pull request
Sep 14, 2019
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