+// Partial function arglists are returned just in their incomplete
+// state: when combined with the music function, the missing parts of
+// the signature can be reconstructed
+//
+// To serve as a partial arglist, the argument list must absolutely
+// _not_ be in "skipping optional arguments" mode since then there is
+// some backup token that has nowhere to go before \etc.
+//
+// So we can skim off an arbitrary number of arguments from the end of
+// the argument list. The argument list remaining afterwards has to
+// be in not-skipping-optional-arguments mode.
+
+function_arglist_partial:
+ EXPECT_SCM function_arglist_optional
+ {
+ $$ = $2;
+ }
+ | EXPECT_SCM function_arglist_partial_optional
+ {
+ $$ = $2;
+ }
+ | EXPECT_OPTIONAL EXPECT_SCM function_arglist_nonbackup
+ {
+ $$ = $3;
+ }
+ | EXPECT_OPTIONAL EXPECT_SCM function_arglist_partial
+ {
+ $$ = $3;
+ }
+ ;
+
+function_arglist_partial_optional:
+ EXPECT_SCM function_arglist_optional
+ {
+ $$ = $2;
+ }
+ | EXPECT_SCM function_arglist_partial_optional
+ {
+ $$ = $2;
+ }
+ | EXPECT_OPTIONAL EXPECT_SCM function_arglist_backup
+ {
+ $$ = $3;
+ }
+ | EXPECT_OPTIONAL EXPECT_SCM function_arglist_partial_optional
+ {
+ $$ = $3;
+ }
+ ;
+