Report missing file name as "", not "." (#899)

internal/report/shortnames.go

@@ -29,6 +29,10 @@ var (
 // fileNameSuffixes returns a non-empty sequence of shortened file names
 // (in decreasing preference) that can be used to represent name.
 func fileNameSuffixes(name string) []string {
+	if name == "" {
+		// Avoid returning "." when symbol info is missing
+		return []string{""}
+	}
 	return allSuffixes(filepath.ToSlash(filepath.Clean(name)), fileSepRE)
 }
 

internal/report/shortnames_test.go

@@ -44,7 +44,7 @@ func TestFileNameSuffixes(t *testing.T) {
 	}
 
 	for _, c := range []testCase{
-		test("empty", "", "."),
+		test("empty", "", ""),
 		test("simple", "foo", "foo"),
 		test("manypaths", "a/b/c", "a/b/c", "b/c", "c"),
 		test("leading", "/a/b", "/a/b", "a/b", "b"),