Index: parse.y
===================================================================
--- parse.y	(revision 32242)
+++ parse.y	(working copy)
@@ -365,6 +365,8 @@
 #define new_evstr(n) new_evstr_gen(parser,(n))
 static NODE *evstr2dstr_gen(struct parser_params*,NODE*);
 #define evstr2dstr(n) evstr2dstr_gen(parser,(n))
+static NODE *dstr_to_dsym_gen(struct parser_params*, NODE*);
+#define dstr_to_dsym(n) dstr_to_dsym_gen(parser,(n))
 static NODE *splat_array(NODE*);
 
 static NODE *call_bin_op_gen(struct parser_params*,NODE*,ID,NODE*);
@@ -733,7 +735,7 @@
 %token tAMPER		/* & */
 %token tLAMBDA		/* -> */
 %token tSYMBEG tSTRING_BEG tXSTRING_BEG tREGEXP_BEG tWORDS_BEG tQWORDS_BEG
-%token tSTRING_DBEG tSTRING_DVAR tSTRING_END tLAMBEG
+%token tSTRING_DBEG tSTRING_DVAR tSTRING_END tLAMBEG tLABEL_END
 
 /*
  *	precedence table
@@ -4203,26 +4205,7 @@
 		    {
 			lex_state = EXPR_END;
 		    /*%%%*/
-			if (!($$ = $2)) {
-			    $$ = NEW_LIT(ID2SYM(rb_intern("")));
-			}
-			else {
-			    VALUE lit;
-
-			    switch (nd_type($$)) {
-			      case NODE_DSTR:
-				nd_set_type($$, NODE_DSYM);
-				break;
-			      case NODE_STR:
-				lit = $$->nd_lit;
-				$$->nd_lit = ID2SYM(rb_intern_str(lit));
-				nd_set_type($$, NODE_LIT);
-				break;
-			      default:
-				$$ = NEW_NODE(NODE_DSYM, Qnil, 1, NEW_LIST($$));
-				break;
-			    }
-			}
+		        $$ = dstr_to_dsym($2);
 		    /*%
 			$$ = dispatch1(dyna_symbol, $2);
 		    %*/
@@ -4765,7 +4748,14 @@
 			$$ = dispatch2(assoc_new, $1, $2);
 		    %*/
 		    }
-		;
+		| tSTRING_BEG string_contents tLABEL_END arg_value
+		    {
+		    /*%%%*/
+			$$ = list_append(NEW_LIST(dstr_to_dsym($2)), $4);
+		    /*%
+			$$ = dispatch2(assoc_new, dispatch1(dyna_symbol, $2), $4);
+		    %*/
+		    };
 
 operation	: tIDENTIFIER
 		| tCONSTANT
@@ -6586,7 +6576,13 @@
 	}
 	else {
 	    token = parse_string(lex_strterm);
-	    if (token == tSTRING_END || token == tREGEXP_END) {
+	    if (token == tSTRING_END && (peek_n('\'', -1) || peek_n('"', -1))) {
+	        if (peek(':') && (lex_state == EXPR_BEG || lex_state == EXPR_ENDARG || IS_ARG())) {
+                    nextc();
+                    token = tLABEL_END;
+                }
+            }
+            if (token == tSTRING_END || token == tREGEXP_END || token == tLABEL_END) {
 		rb_gc_force_recycle((VALUE)lex_strterm);
 		lex_strterm = 0;
 		lex_state = EXPR_END;
@@ -8129,6 +8125,32 @@
 }
 
 static NODE *
+dstr_to_dsym_gen(struct parser_params *parser, NODE *node) {
+    NODE *key;
+    if (!(key = node)) {
+        key = NEW_LIT(ID2SYM(rb_intern("")));
+    }
+    else {
+        VALUE lit;
+    
+        switch (nd_type(key)) {
+          case NODE_DSTR:
+    	    nd_set_type(key, NODE_DSYM);
+    	    break;
+          case NODE_STR:
+    	    lit = key->nd_lit;
+    	    key->nd_lit = ID2SYM(rb_intern_str(lit));
+    	    nd_set_type(key, NODE_LIT);
+    	    break;
+          default:
+    	    key = NEW_NODE(NODE_DSYM, Qnil, 1, NEW_LIST(key));
+    	    break;
+        }
+    }
+    return key;
+}
+
+static NODE *
 call_bin_op_gen(struct parser_params *parser, NODE *recv, ID id, NODE *arg1)
 {
     value_expr(recv);
Index: ext/ripper/eventids2.c
===================================================================
--- ext/ripper/eventids2.c	(revision 32242)
+++ ext/ripper/eventids2.c	(working copy)
@@ -42,6 +42,7 @@
 static ID ripper_id_regexp_beg;
 static ID ripper_id_regexp_end;
 static ID ripper_id_label;
+static ID ripper_id_label_end;
 static ID ripper_id_tlambda;
 static ID ripper_id_tlambeg;
 
@@ -95,6 +96,7 @@
     ripper_id_regexp_beg = rb_intern_const("on_regexp_beg");
     ripper_id_regexp_end = rb_intern_const("on_regexp_end");
     ripper_id_label = rb_intern_const("on_label");
+    ripper_id_label_end = rb_intern_const("on_label_end");
     ripper_id_tlambda = rb_intern_const("on_tlambda");
     ripper_id_tlambeg = rb_intern_const("on_tlambeg");
 
@@ -247,6 +249,7 @@
     {tWORDS_BEG,	&ripper_id_words_beg},
     {tXSTRING_BEG,	&ripper_id_backtick},
     {tLABEL,		&ripper_id_label},
+    {tLABEL_END,	&ripper_id_label_end},
     {tLAMBDA,		&ripper_id_tlambda},
     {tLAMBEG,		&ripper_id_tlambeg},