+char *
+ada_demangle (const char *mangled, int options);
+
+extern char *
+dlang_demangle (const char *mangled, int options);
+
+/* Returns non-zero iff MANGLED is a rust mangled symbol. MANGLED must
+ already have been demangled through cplus_demangle_v3. If this function
+ returns non-zero then MANGLED can be demangled (in-place) using
+ RUST_DEMANGLE_SYM. */
+extern int
+rust_is_mangled (const char *mangled);
+
+/* Demangles SYM (in-place) if RUST_IS_MANGLED returned non-zero for SYM.
+ If RUST_IS_MANGLED returned zero for SYM then RUST_DEMANGLE_SYM might
+ replace characters that cannot be demangled with '?' and might truncate
+ SYM. After calling RUST_DEMANGLE_SYM SYM might be shorter, but never
+ larger. */
+extern void
+rust_demangle_sym (char *sym);
+
+/* Demangles MANGLED if it was GNU_V3 and then RUST mangled, otherwise
+ returns NULL. Uses CPLUS_DEMANGLE_V3, RUST_IS_MANGLED and
+ RUST_DEMANGLE_SYM. Returns a new string that is owned by the caller. */
+extern char *
+rust_demangle (const char *mangled, int options);
+