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https://issues.apache.org/jira/browse/GROOVY-9074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16825515#comment-16825515
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Eric Milles commented on GROOVY-9074:
-------------------------------------
Looks like this method does the filtering:
{{org.codehaus.groovy.transform.stc.StaticTypeCheckingSupport.chooseBestMethod}}.
If I pass an obviously invalid argument type, this method filters a list of
add methods to an empty list. {{chooseBestMethod}} calls {{makeRawTypes}} on
the parameters, which removes the ability to handle the wildcard extends or
super cases.
> CompileStatic does not throw expected exception
> -----------------------------------------------
>
> Key: GROOVY-9074
> URL: https://issues.apache.org/jira/browse/GROOVY-9074
> Project: Groovy
> Issue Type: Bug
> Components: Compiler
> Affects Versions: 2.5.5
> Reporter: Robert Stagner
> Assignee: Daniel Sun
> Priority: Major
>
> While reading about Java Generics and wildcards (see
> [https://docs.oracle.com/javase/tutorial/extra/generics/wildcards.html]), I
> came across the following code in the referenced oracle document
> {code:java}
> Collection<?> c = new ArrayList<String>();
> c.add(new Object()); // Compile time error{code}
> Now, I decided to wrap this in a class and try it out in Java and then in
> Groovy.
> Here is the Java code
>
> {code:java}
> import java.util.*;
> public class TestCollection {
> static Collection<?> c = new ArrayList<String>();
> public static void main(String[] args) {
> c.add(new Object()); // Compile time error
> }
> }
> {code}
>
>
> and here is the groovy code
>
> {code:java}
> import java.util.*;
> import groovy.transform.CompileStatic;
> @CompileStatic
> public class TestCollection {
> static Collection<?> c = new ArrayList<String>();
> public static void main(String[] args) {
> c.add(new Object()); // Compile time error
> println c.first();
> }
> }
> {code}
>
> When I attempt to compile the Java code I get the following expected error
> {code:java}
> $ javac TestCollection.java
> TestCollection.java:7: error: incompatible types: Object cannot be converted
> to CAP#1
> c.add(new Object()); // Compile time error
> ^
> where CAP#1 is a fresh type-variable:
> CAP#1 extends Object from capture of ?{code}
> But, when I run the code through Groovy, I do not get a compile-time error.
> Instead, I get the following output
> {code:java}
> java.lang.Object@41a0aa7d{code}
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