Assigning to a numbered parameter in lambda is expected to result in an error #5605

% bin/mruby -e 'p ->(_1, _2) { _3 = 1 }'
#<Proc:0x8007c50a0@-e:1 (lambda)>

% bin/mruby -e 'p proc { |_1, _2| _3 = 1 }'
-e:1:12: formal argument cannot be a numbered parameter
-e:1:16: formal argument cannot be a numbered parameter
-e:1:22: can't assign to numbered parameter

% ruby31 -e 'p ->(_1, _2) { _3 = 1 }'
-e:1: _1 is reserved for numbered parameter
-e:1: _2 is reserved for numbered parameter
-e:1: _3 is reserved for numbered parameter