Add tested item in the rustdoc --test output

Author: GuillaumeGomez

Diff for: src/librustdoc/test.rs

@@ -418,8 +418,12 @@ impl Collector {
                     should_panic: bool, no_run: bool, should_ignore: bool,
                     as_test_harness: bool, compile_fail: bool, error_codes: Vec<String>,
                     line: usize, filename: String) {
-        let name = format!("{} - line {}", filename, line);
-        self.cnt += 1;
+        let name = if self.use_headers {
+            let s = self.current_header.as_ref().map(|s| &**s).unwrap_or("");
+            format!("{} - {} (line {})", filename, s, line)
+        } else {
+            format!("{} - {} (line {})", filename, self.names.join("::"), line)
+        };
         let cfgs = self.cfgs.clone();
         let libs = self.libs.clone();
         let externs = self.externs.clone();

Diff for: src/test/run-make/issue-22131/Makefile

@@ -4,4 +4,4 @@ all: foo.rs
 	$(RUSTC) --cfg 'feature="bar"' --crate-type lib foo.rs
 	$(HOST_RPATH_ENV) '$(RUSTDOC)' --test --cfg 'feature="bar"' \
 		-L $(TMPDIR) foo.rs |\
-		grep -q 'foo.rs - line 11 ... ok'
+		grep -q 'foo.rs - foo (line 11) ... ok'

Diff for: src/tools/compiletest/src/runtest.rs

@@ -1998,16 +1998,20 @@ actual:\n\
         for _ in res.stdout.split("\n")
                            .filter(|s| s.starts_with("test "))
                            .inspect(|s| {
-                               let tmp: Vec<&str> = s.split(" - line ").collect();
+                               let tmp: Vec<&str> = s.split(" - ").collect();
                                if tmp.len() == 2 {
                                    let path = tmp[0].rsplit("test ").next().unwrap();
                                    if let Some(ref mut v) = files.get_mut(path) {
                                        tested += 1;
-                                       let line = tmp[1].split(" ...")
-                                                        .next()
-                                                        .unwrap_or("0")
-                                                        .parse()
-                                                        .unwrap_or(0);
+                                       let mut iter = tmp[1].split("(line ");
+                                       iter.next();
+                                       let line = iter.next()
+                                                      .unwrap_or(")")
+                                                      .split(")")
+                                                      .next()
+                                                      .unwrap_or("0")
+                                                      .parse()
+                                                      .unwrap_or(0);
                                        if let Ok(pos) = v.binary_search(&line) {
                                            v.remove(pos);
                                        } else {