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lambda: missed return statement error; do not use containing method return type for lambda inference

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This commit is contained in:
Anna Kozlova
2012-09-10 12:24:31 +04:00
parent ae31fc2f27
commit 5a546b640c
8 changed files with 111 additions and 19 deletions
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2
java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/highlighting/ConditionalExpr.java
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@@ -25,7 +25,7 @@ class Test {
{
boolean flag = true;
I i = flag ? (() -> 123) : (() -> 222);
I i1 = flag ? (<error descr="Missing return value">() -> {}</error>) : (() -> 222);
I i1 = flag ? (() -> {<error descr="Missing return statement">}</error>) : (() -> 222);
Object i2 = flag ? (<error descr="Target type of a lambda conversion must be an interface">() -> 42</error>) : (<error descr="Target type of a lambda conversion must be an interface">() -> 222</error>);
I i3 = flag ? (<error descr="Incompatible parameter types in lambda expression">(x) -> 42</error>) : (() -> 222);
I i4 = flag ? (() -> 42) : new I() {

8
java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/highlighting/IncompatibleReturnTypes.java
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@@ -18,7 +18,7 @@ class Test2 {
}
{
IntReturnType aI = <error descr="Incompatible return type void in lambda expression">() -> System.out.println()</error>;
IntReturnType aI1 = <error descr="Missing return value">() -> {System.out.println();}</error>;
IntReturnType aI1 = () -> {System.out.println();<error descr="Missing return statement">}</error>;
IntReturnType aI2 = () -> {return 1;};
IntReturnType aI3 = () -> 1;
}
@@ -32,10 +32,10 @@ class Test3 {
}
{
XReturnType<Object> aI = <error descr="Incompatible return type void in lambda expression">() -> System.out.println()</error>;
XReturnType<Object> aI1 = <error descr="Missing return value">() -> {System.out.println();}</error>;
XReturnType<Object> aI1 = () -> {System.out.println();<error descr="Missing return statement">}</error>;
XReturnType<Object> aI2 = () -> {return 1;};
XReturnType<Object> aI3 = () -> 1;
XReturnType<Object> aI4 = <error descr="Missing return value">() -> {}</error>;
XReturnType<Object> aI4 = () -> {<error descr="Missing return statement">}</error>;
}
}
@@ -48,7 +48,7 @@ class Test4 {
{
YXReturnType<Object> aI = <error descr="Incompatible return type void in lambda expression">() -> System.out.println()</error>;
YXReturnType<Object> aI1 = <error descr="Missing return value">() -> {System.out.println();}</error>;
YXReturnType<Object> aI1 = () -> {System.out.println();<error descr="Missing return statement">}</error>;
YXReturnType<Object> aI2 = <error descr="Incompatible return type int in lambda expression">() -> {return 1;}</error>;
YXReturnType<Object> aI3 = <error descr="Incompatible return type int in lambda expression">() -> 1</error>;
YXReturnType<Object> aI4 = () -> new Y<Object>(){};

43
java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/highlighting/ReturnValue.java Normal file
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@@ -0,0 +1,43 @@
class Test1 {
interface Extractor<T, W> {
Option<W> unapply(T t);
}
public static abstract class Option<T> {
private static class None<T> extends Option<T> {}
private static final Option NONE = new None();
public static <T> Option<T> none() {
return NONE;
}
public static <T> Option<T> option(T value) {
if (value == null) {
return NONE;
} else {
return null;
}
}
}
public static void main(String[] args) {
Extractor<String, Integer> e = s -> {
if (s.equals("1")) {
return Option.option(1);
} else {
return Option.none();
}
};
Extractor<String, Integer> e1 = <error descr="Incompatible return type Option<String> in lambda expression">s -> {
if (s.equals("1")) {
return Option.option(1);
} else {
return Option.option("2");
}
}</error>;
}
}

9
java/java-tests/testData/codeInsight/daemonCodeAnalyzer/lambda/highlighting/UnreachableStatement.java Normal file
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@@ -0,0 +1,9 @@
class Test1 {
{
Comparable<String> c = o -> {
if (o == null) return 1;
return -1;
<error descr="Unreachable statement">System.out.println("Hello");</error>
};
}
}