Fontify constructs following "::" in C++ argument lists correctly.

This fixes bug #24246.

* lisp/progmodes/cc-engine.el (c-find-decl-prefix-search): In the "pseudo
match" loop, test a found string for a match with c-opt-identifier-concat-key
(e.g. with "::").

1 files changed, 7 insertions, 0 deletions

diff --git a/lisp/progmodes/cc-engine.el b/lisp/progmodes/cc-engine.el
index 625e87f109d..1310ef77f7e 100644
--- a/lisp/progmodes/cc-engine.el
+++ b/lisp/progmodes/cc-engine.el
@@ -5168,6 +5168,13 @@ comment at the start of cc-engine.el for more info."
                         (and (< (point) cfd-limit)
                              (c-got-face-at (point) c-literal-faces))))
                t)                     ; Continue the loop over pseudo matches.
+              ((and c-opt-identifier-concat-key
+                    (match-string 1)
+                    (save-excursion
+                      (goto-char (match-beginning 1))
+                      (looking-at c-opt-identifier-concat-key)))
+               ;; Found, e.g., "::" in C++
+               t)
               ((and (match-string 1)
                     (string= (match-string 1) ":")
                     (save-excursion