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https://issues.apache.org/jira/browse/GROOVY-10339?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles updated GROOVY-10339:
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Fix Version/s: (was: 3.0.13)
> STC instantiates parameterized function with a wrong type leading to
> unsoundness
> --------------------------------------------------------------------------------
>
> Key: GROOVY-10339
> URL: https://issues.apache.org/jira/browse/GROOVY-10339
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Reporter: Thodoris Sotiropoulos
> Assignee: Eric Milles
> Priority: Major
> Fix For: 4.0.0-rc-1
>
>
> I have the following program
> {code:java}
> class Test {
> static <T> T bar(T x, T y) { return x; }
> static String m() { return ""; }
> static void main(String[] args) {
> Integer x = bar(m(), 1); // STC misses the error.
> }
> }
> {code}
> h3. Actual behaviour
> groovyc incorrectly accepts the above program, although it contains a type
> error at line7. This leads to the following exception at runtime:
> {code}
> 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:179)
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.continueCastOnNumber(DefaultTypeTransformation.java:294)
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToType(DefaultTypeTransformation.java:251)
> at
> org.codehaus.groovy.vmplugin.v8.IndyInterface.fromCache(IndyInterface.java:318)
> at Test.main(test.groovy:7)
> {code}
> h3. Expected behaviour
> The compiler should have rejected the program.
> Tested against master.
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