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Eric Milles resolved GROOVY-10272. ---------------------------------- Fix Version/s: 5.0.0-alpha-1 Resolution: Fixed https://github.com/apache/groovy/commit/16f6be8639c15e227efc0154604b6bd8f8ffe1ae > 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: 5.0.0-alpha-1 > > > 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. -- This message was sent by Atlassian Jira (v8.20.7#820007)