fix: Don't hang on unresolved attribute on extern block and its children #8910
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jonas-schievink
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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
ModCollectorinstead.Fixes #8414 (comment)
Fixes #8905
Fixes #8909
bors r+