Exception raised when mutating pattern matching

[HashNotAdam]

Given the following code:

case some_method_call
in {result: true}
  success_thing
in {result: false, error:}
  failure_thing
end

I receive this error from mutant:

Killfork exited nonzero. Its result (if any) was ignored.
Process status:
#<Process::Status: pid 33464 exit 1>
Log messages (combined stderr and stdout):
[killfork] ...mutant-0.11.27/lib/mutant/loader.rb:30:in `eval': path_to_my_class.rb:28: syntax error, unexpected terminator, expecting literal content or tSTRING_DBEG or tSTRING_DVAR or tLABEL_END (SyntaxError)
[killfork]         in {%(): true} then
[killfork]               ^
[killfork] 
[killfork]      from ...mutant-0.11.27/lib/mutant/loader.rb:30:in `call'
[killfork]      from ...mutant-0.11.27/lib/mutant/loader.rb:19:in `call'
[killfork]      from ...mutant-0.11.27/lib/mutant/mutation.rb:67:in `insert'
[killfork]      from ...mutant-0.11.27/lib/mutant/env.rb:165:in `block in run_mutation_tests'
...

The subsequent diff looks like:

   case some_method_call
-  in {result: true} then
+  in {%(): true} then
     success_thing
   in {result: false, error:} then
     failure_thing
   end

My stack is:

• mutant 0.11.27
• Ruby 3.3.0

[mbj]

@HashNotAdam Thanks for the report, fixed with v0.11.28 I have just released!