Lyuben Atanasov created GROOVY-10236:
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Summary: Parser fails to parse a single-statement lambda when
omitting parentheses for method call
Key: GROOVY-10236
URL: https://issues.apache.org/jira/browse/GROOVY-10236
Project: Groovy
Issue Type: Bug
Components: parser, parser-antlr4
Affects Versions: 4.0.0-beta-1
Reporter: Lyuben Atanasov
The parser fails to parse the following code:
{code}
class Test {
public void test() {
[1, 2, 3, 4, 5].stream().forEach(num -> println "$num");
}
}
{code}
The produced error is:
{noformat}
Exception in thread "main"
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
Script_30c2a85fbeaac50f95df1e8ce776b5dd.groovy: 4: Unexpected input: '(' @ line
4, column 41.
, 2, 3, 4, 5].stream().forEach(num -> pr
^
{noformat}
This problem appears only after 4.0.0-beta-1.
The following expressions are parsed successfully:
{code}
[1, 2, 3, 4, 5].stream().forEach(num -> { println "$num" });
[1, 2, 3, 4, 5].stream().forEach(num -> println("$num"));
{code}
There is also something curious: if I modify the original code and wrap the
parameter {{num}} in parentheses ({{.forEach((num) -> println "$num")}}), the
parser does not complain, but {{println}} is recognized as a variable rather
than a method.
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