1 files changed, 4 insertions, 0 deletions
diff --git a/parse.y b/parse.y
index 7d1d81f9ef..885b5d312e 100644
--- a/parse.y
+++ b/parse.y
@@ -3300,10 +3300,14 @@ yylex()
 		    rb_warn("invalid character syntax; use ?\\%c", c);
 		}
 	    }
+	  ternary:
 	    pushback(c);
 	    lex_state = EXPR_BEG;
 	    return '?';
 	}
+	if ((ISALNUM(c) || c == '_') && lex_p < lex_pend && is_identchar(*lex_p)) {
+	    goto ternary;
+	}
 	else if (c == '\\') {
 	    c = read_escape();
 	}