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https://issues.apache.org/jira/browse/GROOVY-10272?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eric Milles updated GROOVY-10272:
---------------------------------
Fix Version/s: 4.0.5
(was: 5.0.0-alpha-1)
> Wrong inference when using ternary operator with lambdas
> --------------------------------------------------------
>
> Key: GROOVY-10272
> URL: https://issues.apache.org/jira/browse/GROOVY-10272
> Project: Groovy
> Issue Type: Bug
> Components: Static compilation, Static Type Checker
> Affects Versions: 4.0.0-alpha-3, 4.0.0-beta-1, 3.0.9
> Reporter: Stefanos Chaliasos
> Assignee: Eric Milles
> Priority: Major
> Fix For: 4.0.5
>
>
> I have the following Groovy program.
> {code:groovy}
> import java.util.function.Function;
> @groovy.transform.TypeChecked
> class Main {
> public static final void main() {
> Function<Long, Double> x
> // Works
> if (true) {
> x = {Long a -> (Double) a}
> } else {
> x = {Long b -> (Double) b}
> }
> // Fails
> Function<Long, Double> y = ((true) ? {Long a -> (Double) a} : {Long b
> -> (Double) b})
> }
> }
> {code}
> h2. Actual Behavior
> The program does not compile, and I get the following error.
> {code:java}
> org.codehaus.groovy.control.MultipleCompilationErrorsException: startup
> failed:
> Main.groovy: 16: [Static type checking] - Cannot assign value of type
> java.lang.Double to variable of type
> java.util.function.Function<java.lang.Long, java.lang.Double>
> @ line 16, column 36.
> Function<Long, Double> y = ((true) ? {Long a -> (Double) a} :
> {Long b -> (Double) b})
> ^
> 1 error
> {code}
> Note that the computed type is the return type of the lambdas.
> h2. Expected Behavior
> Compile successfully.
> h2. Comment
> Tested against 4-beta-1, 4-alpha-3, 3.0.9, and master (commit:
> b26dbbeabe1e3d27d30c936701b1a571e24d5ab2). Maybe similar to GROOVY-10271.
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