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Various whitespace-related changes did not so far respect
`--file-lines`, see also [#5136](tests/target/issue-5136-4.rs). This PR
fixes this in all of the cases reported in #5136:
* Newlines at the beginning of the file
* Spaces at the beginning of the file
* Missing newline at the end of the file
* Space after a doc comment
* Space before a comment in the last line of the file (without trailing
newline)
The PR includes tests that fail without the fixes.
U007D pushed a commit
to U007D/rust-mos
that referenced
this pull request
Aug 21, 2026
5136: Split namespace maps in `ItemScope` r=jonas-schievink a=jonas-schievink
Reduces memory usage of the CrateDefMap query by ~130 MB (50%) on r-a.
I was also looking into handling glob imports more efficiently (storing scope chains instead of always duplicating everything into the glob-importing module's scope), but it seems that this already gives the most significant wins.
Co-authored-by: Jonas Schievink <jonas.schievink@ferrous-systems.com>
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