Add support for named deconstruction of Multi-Variable Data Pipes

[leonard84]

No description provided.

[codecov]

Codecov Report

Merging #1463 (c94aec3) into master (3f9817c) will increase coverage by 79.73%.
The diff coverage is 83.33%.

@@              Coverage Diff              @@
##             master    #1463       +/-   ##
=============================================
+ Coverage          0   79.73%   +79.73%     
- Complexity        0     4023     +4023     
=============================================
  Files             0      411      +411     
  Lines             0    12715    +12715     
  Branches          0     1649     +1649     
=============================================
+ Hits              0    10138    +10138     
- Misses            0     1982     +1982     
- Partials          0      595      +595     

Impacted Files	Coverage Δ
...main/java/org/spockframework/compiler/AstUtil.java	80.27% <80.00%> (ø)
...rg/spockframework/compiler/WhereBlockRewriter.java	94.01% <100.00%> (ø)
...it4/JUnit4AnnotationLifecycleMethodsExtension.java	92.68% <0.00%> (ø)
...rg/spockframework/mock/runtime/MockController.java	100.00% <0.00%> (ø)
...rk/runtime/extension/builtin/TempDirExtension.java	85.71% <0.00%> (ø)
...kframework/spring/mock/SpockMockPostprocessor.java	85.03% <0.00%> (ø)
...ckframework/report/log/ReportLogConfiguration.java	100.00% <0.00%> (ø)
...ime/extension/builtin/PendingFeatureExtension.java	100.00% <0.00%> (ø)
...org/spockframework/unitils/UnitilsInterceptor.java	87.50% <0.00%> (ø)
...work/runtime/extension/builtin/TitleExtension.java	100.00% <0.00%> (ø)
... and 403 more

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[marcphilipp]

Looks good from a user's perspective! I can't really speak to the AST transform, though.