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https://issues.apache.org/jira/browse/GROOVY-11305?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles updated GROOVY-11305:
---------------------------------
    Description: 
Consider the following:
{code:groovy}
class C { // implicitly Iterable<String>
  Iterator<String> iterator() {} // sometimes supplied via DGM
}

@TypeChecked
void test(C c) {
  for (string in c) {
    string.toUpperCase()
  }
}
{code}

If "@TypeChecked" is removed, this works.  STC cannot determine the loop 
element type -- see {{StaticTypeCheckingVisitor#inferLoopElementType}} and 
compare with {{inferComponentType}} which runs for spread.

  was:
Consider the following:
{code:groovy}
class C { // implicitly Iterable<String>
  Iterator<String> iterator() {}
}

@TypeChecked
void test(C c) {
  for (string in c) {
    string.toUpperCase()
  }
}
{code}

If "@TypeChecked" is removed, this works.  STC cannot determine the loop 
element type -- see {{StaticTypeCheckingVisitor#inferLoopElementType}} and 
compare with {{inferComponentType}} which runs for spread.


> STC: support for-each or for-in loop for implicitly-Iterable type
> -----------------------------------------------------------------
>
>                 Key: GROOVY-11305
>                 URL: https://issues.apache.org/jira/browse/GROOVY-11305
>             Project: Groovy
>          Issue Type: Improvement
>          Components: Static Type Checker
>            Reporter: Eric Milles
>            Assignee: Eric Milles
>            Priority: Major
>
> Consider the following:
> {code:groovy}
> class C { // implicitly Iterable<String>
>   Iterator<String> iterator() {} // sometimes supplied via DGM
> }
> @TypeChecked
> void test(C c) {
>   for (string in c) {
>     string.toUpperCase()
>   }
> }
> {code}
> If "@TypeChecked" is removed, this works.  STC cannot determine the loop 
> element type -- see {{StaticTypeCheckingVisitor#inferLoopElementType}} and 
> compare with {{inferComponentType}} which runs for spread.



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