drccrd opened a new issue, #6891:
URL: https://github.com/apache/incubator-kie/issues/6891
### Describe the bug
The ANTLR4 DRL parser (`DRL10ParserWrapper`) cannot parse Java 8 functional
syntax inside a `function` declaration's body, while the legacy parser accepts
it. Rules using such functions compile today only because
`drools.drl.antlr4.parser.enabled` defaults to `false`; they will stop
compiling when the ANTLR4 parser becomes the default.
### Expected behavior
The ANTLR4 parser supports patterns supported by the ANTLR3 parser,
including functions in DRL
### Actual behavior
Line X:Y missing ';' at '<token>'
### How to Reproduce?
any of these as a DRL function body:
```drl
package org.example;
function void f( java.util.List xs, java.util.List out )
{
xs.forEach(e -> out.add(e)); // lambda
}
```
```drl
function void g( java.util.List xs, java.util.List out )
{
xs.forEach(out::add); // method reference
}
```
### Output of `uname -a` or `ver`
_No response_
### Output of `java -version`
_No response_
### GraalVM version (if different from Java)
_No response_
### Kogito version or git rev (or at least Quarkus version if you are using
Kogito via Quarkus platform BOM)
10.2.0
### Build tool (ie. output of `mvnw --version` or `gradlew --version`)
_No response_
### Additional information
_No response_
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