jonnybot0 opened a new pull request, #2270:
URL: https://github.com/apache/groovy/pull/2270
It looks like a subtle compilation bug was introduced in
33064484cc043bfb7c2ad75ee8fccbcbc6329b76.
Under the hood, the root cause seemed to be this:
Caused by: java.lang.UnsupportedOperationException
at java.base/java.util.AbstractMap.put(AbstractMap.java:209)
at
org.codehaus.groovy.control.ResolveVisitor.resolveGenericsHeader(ResolveVisitor.java:1452)
at
org.codehaus.groovy.control.ResolveVisitor.resolveGenericsHeader(ResolveVisitor.java:1409)
Based on a look in the debugger, without the change in this PR, the
genericParameterNames field will be a Collections$EmptyMap, which is immutable
and therefore doesn't support PUT operations, leading to the above exception.
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