GROOVY-11601: remove support for expression list in for-each statement

[eric-milles]

https://issues.apache.org/jira/browse/GROOVY-11601

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.6805%. Comparing base (876fbed) to head (6237562).
Report is 101 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2174        +/-   ##
==================================================
+ Coverage     68.8710%   70.6805%   +1.8095%     
- Complexity      29570      33592      +4022     
==================================================
  Files            1421       1423         +2     
  Lines          113714     124361     +10647     
  Branches        19715      23225      +3510     
==================================================
+ Hits            78316      87899      +9583     
- Misses          28787      29711       +924     
- Partials         6611       6751       +140     

Files with missing lines	Coverage Δ
...va/org/apache/groovy/parser/antlr4/AstBuilder.java	89.4434% <100.0000%> (+3.1201%)	⬆️

... and 42 files with indirect coverage changes

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[daniellansun]

It's better not to break existing users' code unless we have to do.

[eric-milles]

Do you have an example of something that requires this? It is quite costly to support arbitrary expression list in for loop.

[paulk-asert]

I added some example to the Jira and asked Jochen (via slack) if he had other examples (but he hasn't responded yet).