Christopher Smith created GROOVY-11275:
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Summary: Support type witness in method reference
Key: GROOVY-11275
URL: https://issues.apache.org/jira/browse/GROOVY-11275
Project: Groovy
Issue Type: Improvement
Components: Compiler, parser-antlr4
Affects Versions: 4.0.17
Reporter: Christopher Smith
Java permits type witnesses as part of a method reference to provide the usual
hinting:
{code:java}
Optional<List<Number>> foo = Optional.of(42).map(List::<Number>of);
{code}
The Groovy grammar as of 4.0.17 does not support type witnesses in this
position, but there are a number of cases where the compiler (particularly the
STC) has limitations with type inference and it would be helpful to have.
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