Rollup of 11 pull requests#151997

Closed

JonathanBrouwer wants to merge 26 commits intorust-lang:mainfrom

JonathanBrouwer:rollup-txk7tC8

Commits on Jan 15, 2026

Use default field values in a few more cases
estebank
committed

Commits on Jan 26, 2026

compiletest: Support `--extern` modifiers with `proc-macro` directive
Enselic
committed

Commits on Jan 28, 2026

link modifier `export-symbols`: export all global symbols from selected uptream c static libraries
cezarbbb
committed

Commits on Jan 30, 2026

regression test for alias-relate changes in lub
jdonszelmann
committed

Commits on Feb 2, 2026