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 71.4704%. Comparing base (876fbed) to head (6237562).
⚠️ Report is 854 commits behind head on master.

Additional details and impacted files

@@                Coverage Diff                 @@
##               master      #2174        +/-   ##
==================================================
+ Coverage     68.8710%   71.4704%   +2.5994%     
- Complexity      29570      35204      +5634     
==================================================
  Files            1421       1423         +2     
  Lines          113714     129434     +15720     
  Branches        19715      25501      +5786     
==================================================
+ Hits            78316      92507     +14191     
- Misses          28787      30202      +1415     
- Partials         6611       6725       +114     

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

... and 75 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).

[eric-milles]

sorry, I keep misinterpreting the icon in the branches list