style: Add formatting for extern_ty!

Author: tgross35

ci/style.py

@@ -9,7 +9,6 @@
 from glob import iglob
 from pathlib import Path
 
-
 FMT_DIRS = ["src", "ci"]
 IGNORE_FILES = [
     # Too much special syntax that we don't want to format
@@ -87,6 +86,9 @@ def fmt_one(fpath: Path, check_only: bool):
     # syntax. Replace it with a dummy name.
     text = re.sub(r"enum #anon\b", r"enum _fmt_anon", text)
 
+    # `extern_ty!` can be formatted as an extern block.
+    text = re.sub(r"extern_ty!", r'extern "extern-ty-macro"', text)
+
     # If enum variants are annotated with `pub`, rustfmt erases the visibility. To get
     # around this we first match on all enums to extract their bodies, then look for `pub`
     # visibility indicators. If found, these get stashed in a comment on the preceding
@@ -126,6 +128,7 @@ def enum_sub(m: re.Match) -> str:
     text = re.sub(r"cfg_tmp!\(\[(.*?)\]\)", r"#[cfg(\1)]", text, flags=re.DOTALL)
     text = re.sub(r"enum _fmt_anon", r"enum #anon", text)
     text = re.sub(r"/\* FMT-VIS (.*) END-FMT-VIS \*/\n\s*", r"\1 ", text)
+    text = re.sub(r'extern "extern-ty-macro"', r"extern_ty!", text)
 
     # And write the formatted file back
     fpath.write_text(text)