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https://issues.apache.org/jira/browse/GROOVY-11496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17891064#comment-17891064
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Eric Milles commented on GROOVY-11496:
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This is supported by the getAt method. The one you are getting for a list is
this one:
https://docs.groovy-lang.org/latest/html/groovy-jdk/java/util/List.html#getAt(java.util.Collection)
To type check, the collection would need some type arguments, like “? extends
Number”
At this time, anything that is convertible to Number works.
> missing type mismatch when indexing lists
> -----------------------------------------
>
> Key: GROOVY-11496
> URL: https://issues.apache.org/jira/browse/GROOVY-11496
> Project: Groovy
> Issue Type: Bug
> Components: Static Type Checker
> Reporter: Thodoris Sotiropoulos
> Priority: Minor
>
> I have the following program
> {code:java}
> class Test {
> public static void main(String[] args) {
> List<Boolean> x = [true];
> List<Boolean> y = [true];
> x[y]
> }
> } {code}
> h3. Actual behavior
> The code compiles, but there's runtime error
> {code:java}
> Exception in thread "main"
> org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast
> object 'true' with class 'java.lang.Boolean' to class 'int'
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.castToNumber(DefaultTypeTransformation.java:177)
> at
> org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation.intUnbox(DefaultTypeTransformation.java:85)
> at
> org.codehaus.groovy.runtime.DefaultGroovyMethods.getAt(DefaultGroovyMethods.java:6195)
> at Test.main(test.groovy:5) {code}
> h3. Expected behavior
> The code should have been rejected.
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