Fix #44968 Windows path in UI tests

Author: clippered

src/test/ui/lint/unused_parens_json_suggestion.rs

@@ -10,8 +10,6 @@
 
 // compile-flags: --error-format json
 
-// ignore-windows (see Issue #44968)
-
 // The output for humans should just highlight the whole span without showing
 // the suggested replacement, but we also want to test that suggested
 // replacement only removes one set of parentheses, rather than naïvely

src/test/ui/lint/unused_parens_json_suggestion.stderr

@@ -1 +1 @@
-{"message":"unnecessary parentheses around assigned value","code":null,"level":"warning","spans":[{"file_name":"$DIR/unused_parens_json_suggestion.rs","byte_start":1014,"byte_end":1027,"line_start":24,"line_end":24,"column_start":14,"column_end":27,"is_primary":true,"text":[{"text":"    let _a = (1 / (2 + 3));","highlight_start":14,"highlight_end":27}],"label":null,"suggested_replacement":null,"expansion":null}],"children":[{"message":"#[warn(unused_parens)] on by default","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"remove these parentheses","code":null,"level":"help","spans":[{"file_name":"$DIR/unused_parens_json_suggestion.rs","byte_start":1014,"byte_end":1027,"line_start":24,"line_end":24,"column_start":14,"column_end":27,"is_primary":true,"text":[{"text":"    let _a = (1 / (2 + 3));","highlight_start":14,"highlight_end":27}],"label":null,"suggested_replacement":"1 / (2 + 3)","expansion":null}],"children":[],"rendered":"    let _a = 1 / (2 + 3);"}],"rendered":null}
+{"message":"unnecessary parentheses around assigned value","code":null,"level":"warning","spans":[{"file_name":"$DIR/unused_parens_json_suggestion.rs","byte_start":976,"byte_end":989,"line_start":22,"line_end":22,"column_start":14,"column_end":27,"is_primary":true,"text":[{"text":"    let _a = (1 / (2 + 3));","highlight_start":14,"highlight_end":27}],"label":null,"suggested_replacement":null,"expansion":null}],"children":[{"message":"#[warn(unused_parens)] on by default","code":null,"level":"note","spans":[],"children":[],"rendered":null},{"message":"remove these parentheses","code":null,"level":"help","spans":[{"file_name":"$DIR/unused_parens_json_suggestion.rs","byte_start":976,"byte_end":989,"line_start":22,"line_end":22,"column_start":14,"column_end":27,"is_primary":true,"text":[{"text":"    let _a = (1 / (2 + 3));","highlight_start":14,"highlight_end":27}],"label":null,"suggested_replacement":"1 / (2 + 3)","expansion":null}],"children":[],"rendered":"    let _a = 1 / (2 + 3);"}],"rendered":null}

src/tools/compiletest/src/runtest.rs

@@ -2325,8 +2325,15 @@ actual:\n\
 
     fn normalize_output(&self, output: &str, custom_rules: &[(String, String)]) -> String {
         let parent_dir = self.testpaths.file.parent().unwrap();
-        let parent_dir_str = parent_dir.display().to_string();
+        let cflags = self.props.compile_flags.join(" ");
+        let parent_dir_str = if cflags.contains("--error-format json") {
+            parent_dir.display().to_string().replace("\\", "\\\\")
+        } else {
+            parent_dir.display().to_string()
+        };
+
         let mut normalized = output.replace(&parent_dir_str, "$DIR")
+              .replace("\\\\", "\\") // denormalize for paths on windows
               .replace("\\", "/") // normalize for paths on windows
               .replace("\r\n", "\n") // normalize for linebreaks on windows
               .replace("\t", "\\t"); // makes tabs visible