Explain why tests/ui-fulldeps/ is unformatted.

nnethercote · nnethercote · commit d2ea692e2d4f · 2024-06-04T14:15:45.000+10:00
diff --git a/rustfmt.toml b/rustfmt.toml
@@ -21,7 +21,7 @@ ignore = [
     "/tests/rustdoc-gui/",            # Some tests are sensitive to source code layout.
     "/tests/rustdoc-ui/",             # Some have syntax errors, some are whitespace-sensitive.
     "/tests/ui/",                     # Some have syntax errors, some are whitespace-sensitive.
-    "/tests/ui-fulldeps/",
+    "/tests/ui-fulldeps/",            # Some are whitespace-sensitive (e.g. `// ~ERROR` comments).
 
     # Do not format submodules.
     # FIXME: sync submodule list with tidy/bootstrap/etc
