[ruby/prism] Fix modifier rescue pattern matching

[Bug #21713]

ruby/prism@02c944c055

Author: kddnewton

prism/prism.c

@@ -21740,6 +21740,19 @@ parse_expression(pm_parser_t *parser, pm_binding_power_t binding_power, bool acc
                     return node;
                 }
                 break;
+            case PM_RESCUE_MODIFIER_NODE:
+                // A rescue modifier whose handler is a one-liner pattern match
+                // (=> or in) produces a statement. That means it cannot be
+                // extended by operators above the modifier level.
+                if (pm_binding_powers[parser->current.type].left > PM_BINDING_POWER_MODIFIER) {
+                    pm_rescue_modifier_node_t *cast = (pm_rescue_modifier_node_t *) node;
+                    pm_node_t *rescue_expression = cast->rescue_expression;
+
+                    if (PM_NODE_TYPE_P(rescue_expression, PM_MATCH_REQUIRED_NODE) || PM_NODE_TYPE_P(rescue_expression, PM_MATCH_PREDICATE_NODE)) {
+                        return node;
+                    }
+                }
+                break;
             default:
                 break;
         }

test/prism/errors/match_predicate_after_rescue_with_dot_method_call.txt

@@ -1,3 +1,4 @@
 'a' rescue 2 in 3.upcase
                  ^ unexpected '.', expecting end-of-input
+                 ^ unexpected '.', ignoring it
 

test/prism/errors/match_predicate_after_rescue_with_opreator.txt

@@ -1,3 +1,4 @@
 1 rescue 2 in 3 << 4
                 ^~ unexpected <<, expecting end-of-input
+                ^~ unexpected <<, ignoring it
 

test/prism/errors/match_required_after_rescue_with_dot_method_call.txt

@@ -1,3 +1,4 @@
 1 rescue 2 => 3.inspect
                ^ unexpected '.', expecting end-of-input
+               ^ unexpected '.', ignoring it
 

test/prism/errors/match_required_after_rescue_with_opreator.txt

@@ -1,3 +1,4 @@
 1 rescue 2 => 3 ** 4
                 ^~ unexpected '**', expecting end-of-input
+                ^~ unexpected '**', ignoring it
 

test/prism/errors/rescue_pattern.txt

@@ -0,0 +1,4 @@
+a rescue b => c in d
+                ^~ unexpected 'in', expecting end-of-input
+                ^~ unexpected 'in', ignoring it
+