Patch tidy to account for //@ style UI tests

Author: jieyouxu

src/tools/tidy/src/style.rs

@@ -55,11 +55,14 @@ const ANNOTATIONS_TO_IGNORE: &[&str] = &[
     "// CHECK",
     "// EMIT_MIR",
     "// compile-flags",
+    "//@ compile-flags",
     "// error-pattern",
+    "//@ error-pattern",
     "// gdb",
     "// lldb",
     "// cdb",
     "// normalize-stderr-test",
+    "//@ normalize-stderr-test",
 ];
 
 // Intentionally written in decimal rather than hex
@@ -128,7 +131,15 @@ fn should_ignore(line: &str) -> bool {
     // This mirrors the regex in src/tools/compiletest/src/runtest.rs, please
     // update both if either are changed.
     let re = Regex::new("\\s*//(\\[.*\\])?~.*").unwrap();
-    re.is_match(line) || ANNOTATIONS_TO_IGNORE.iter().any(|a| line.contains(a))
+    // For `ui_test`-style UI test directives, also ignore
+    // - `//@[rev] compile-flags`
+    // - `//@[rev] normalize-stderr-test`
+    let ui_test_long_directives =
+        Regex::new("\\s*//@(\\[.*\\]) (compile-flags|normalize-stderr-test|error-pattern).*")
+            .unwrap();
+    re.is_match(line)
+        || ANNOTATIONS_TO_IGNORE.iter().any(|a| line.contains(a))
+        || ui_test_long_directives.is_match(line)
 }
 
 /// Returns `true` if `line` is allowed to be longer than the normal limit.

src/tools/tidy/src/ui_tests.rs

@@ -15,7 +15,7 @@ use std::path::{Path, PathBuf};
 const ENTRY_LIMIT: usize = 900;
 // FIXME: The following limits should be reduced eventually.
 const ISSUES_ENTRY_LIMIT: usize = 1794;
-const ROOT_ENTRY_LIMIT: usize = 870;
+const ROOT_ENTRY_LIMIT: usize = 871;
 
 const EXPECTED_TEST_FILE_EXTENSIONS: &[&str] = &[
     "rs",     // test source files