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Add `extern "custom"` - #2300

Merged

traviscross merged 14 commits into

rust-lang:masterfrom

folkertdev:extern-custom

Aug 16, 2026

Merged

Add `extern "custom"`#2300
traviscross merged 14 commits into
rust-lang:masterfrom
folkertdev:extern-custom

Commits on Jun 27, 2026
- add `extern "custom"`
  folkertdev
  committed
  0a83cc3
Commits on Jul 29, 2026
- Update src/items/external-blocks.md
  
  folkertdev
  and
  traviscross
  authored
  2890548
- add rules for parameters and return type
  folkertdev
  committed
  c979f98
Commits on Aug 4, 2026
- Add missing header for `extern "custom"`
  traviscross
  committed
  38b00b1
- Say that an `extern "custom"` fn *must* not have params
  traviscross
  committed
  20aeb84
- Add rules on `extern "custom"` `fn()` signatures
  traviscross
  committed
  9ea9daf
Commits on Aug 5, 2026
- Add example to the `extern "custom"` section
  traviscross
  committed
  ae9e6b9
- Note that naked functions often want `extern "custom"`
  traviscross
  committed
  66b3bc5
Commits on Aug 14, 2026
- note that the unit return type is syntactic: aliases are not resolved
  folkertdev
  committed
  7474a51
- note that the cold attribute is rejected
  folkertdev
  committed
  217edc5
Commits on Aug 15, 2026
- Revise the new `extern "custom"` rules
  traviscross
  committed
  99dfffa
- Move `extern "custom"` `cold` rule to `cold` attribute
  traviscross
  committed
  0a7b870
- Add example for `cold` on `extern "custom"` functions
  traviscross
  committed
  2a4f50f
- Add example for non-unit return with `extern "custom"`
  traviscross
  committed
  4956ce9