Thodoris Sotiropoulos created GROOVY-11471:
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Summary: Assignments in closures can introduce issues in flow
typing
Key: GROOVY-11471
URL: https://issues.apache.org/jira/browse/GROOVY-11471
Project: Groovy
Issue Type: Bug
Components: Static Type Checker
Reporter: Thodoris Sotiropoulos
I have the following program
{code:java}
class Test {
public static void main(String[] args) {
def x = 1
Closure m = null
if (true) {
m = {x = ""}
}
x = 1
m()
}
} {code}
h3. Actual behavior
The code compiles, but I get ClassCastException at runtime
{code:java}
Exception in thread "main"
org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast
object '' with class 'java.lang.String' to class 'java.lang.Integer'
at
org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToNumber(DefaultTypeTransformation.java:177)
at
org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnNumber(DefaultTypeTransformation.java:294)
at
org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java:248)
at
org.codehaus.groovy.vmplugin.v8.IndyInterface.fromCache(IndyInterface.java:336)
at Test$_main_closure1.doCall(test.groovy:6)
at Test$_main_closure1.call(test.groovy)
at Test.main(test.groovy:9)
{code}
h3. Expected behavior
The code should have been rejected.
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