Document that test names cannot contain dots (#1927)

rust-lang · Mar 8, 2024 · f863101 · f863101
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commit f863101
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diff --git a/src/tests/ui.md b/src/tests/ui.md
@@ -64,6 +64,9 @@ The general form is:
 
 *test-name*`.`*revision*`.`*compare_mode*`.`*extension*
 
+* *test-name* cannot contain dots. This is so that the general form of test
+  output filenames have a predictable form we can pattern match on in order to
+  track stray test output files.
 * *revision* is the [revision](#cfg-revisions) name.
   This is not included when not using revisions.
 * *compare_mode* is the [compare mode](#compare-modes).