de403b1044
8910: Don't lower extern block in the ItemTree r=jonas-schievink a=jonas-schievink
The ItemTree lowering code used to attach attributes on an `extern {}` block to all the children. This is wrong and causes problems with attribute resolution that manifested as a hang.
This PR treats extern blocks as first-class items in the ItemTree and lowers its contents in the `ModCollector` instead.
Fixes https://github.com/rust-analyzer/rust-analyzer/issues/8414#issuecomment-845607923
Fixes https://github.com/rust-analyzer/rust-analyzer/issues/8905
Fixes https://github.com/rust-analyzer/rust-analyzer/issues/8909
bors r+
Co-authored-by: Jonas Schievink <jonasschievink@gmail.com>
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