dialects: (pdl) Filecheck test documenting how to match an MLIR operation without return type

[qaco]

Filecheck test documenting how to match an MLIR operation without return type

[superlopuh]

This looks good but I'm not sure what the purpose is. Is it documentation, or to make sure that we don't break this syntax in the future?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.09%. Comparing base (21b6a60) to head (95895a7).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3358      +/-   ##
==========================================
+ Coverage   90.06%   90.09%   +0.03%     
==========================================
  Files         447      447              
  Lines       56532    56578      +46     
  Branches     5425     5431       +6     
==========================================
+ Hits        50915    50975      +60     
+ Misses       4184     4166      -18     
- Partials     1433     1437       +4     

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[qaco]

This looks good but I'm not sure what the purpose is. Is it documentation, or to make sure that we don't break this syntax in the future?

Both. Since the explicit syntax with -> () is also intuitive but not yet implemented, this test shows - and guarantees - that there is a correct way to program this behavior. This saves the person who needs it from having to hack the parser for nothing.

[superlopuh]

Sounds good, thank you!