Stefanos Chaliasos created GROOVY-10272:
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Summary: 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: 3.0.9, 4.0.0-beta-1, 4.0.0-alpha-3
Reporter: Stefanos Chaliasos
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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