Scott Murphy Heiberg created GROOVY-12672:
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Summary: SC: a lambda that reads delegate, owner, resolveStrategy
or maximumNumberOfParameters throws ClassCastException
Key: GROOVY-12672
URL: https://issues.apache.org/jira/browse/GROOVY-12672
Project: Groovy
Issue Type: Bug
Affects Versions: 6.0.0, 7.0.0-alpha-1
Reporter: Scott Murphy Heiberg
{code:groovy}
import groovy.transform.CompileStatic
import java.util.function.Supplier
@CompileStatic
class C {
def m() {
Supplier<Object> s = () -> delegate
s.get()
}
}
assert new C().m() instanceof C
{code}
*Actual:* {{java.lang.ClassCastException: class java.lang.Class cannot be cast
to class C$_m_lambda1}}. The same happens for {{owner}},
{{maximumNumberOfParameters}}, {{resolveStrategy}}, {{parameterTypes}},
{{directive}} and {{metaClass}}, in instance and static methods, in nested
lambdas and in a lambda inside a closure. Assigning {{resolveStrategy}} fails
with {{NoSuchMethodException: java.lang.Class.setProperty}}.
*Expected:* the property is read from the lambda. {{delegate}} and {{owner}}
are the enclosing object, as for {{thisObject}} and as the type checker infers;
in a static method they are the class. 4.0.33 and 5.0.8 do not throw; they
return the class for {{delegate}} and {{owner}}.
Cause: since GROOVY-11905, a lambda that does not touch the enclosing instance
gets a static {{doCall}}. Only {{this}}, {{super}} and {{thisObject}} counted
as such access ({{StaticTypesLambdaAnalyzer}}), so a closure property is read
from the enclosing Class instead of the lambda.
Verified: 6.0.0 and master affected; 4.0.33 and 5.0.8 not affected.
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