1 /*
 2  * Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  * This code is free software; you can redistribute it and/or modify it
 6  * under the terms of the GNU General Public License version 2 only, as
 7  * published by the Free Software Foundation.
 8  *
 9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
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22  */
23 
24 /*
25  * @test /nodynamiccopyright/
26  * @modules jdk.incubator.code
27  * @compile/fail/ref=TestMethodCall.out -Xlint:-incubating -XDrawDiagnostics TestMethodCall.java
28  */
29 
30 import jdk.incubator.code.Quoted;
31 
32 public class TestMethodCall {
33     void test(boolean cond) {
34         apply(() -> {});
35         apply((int i) -> ""); // ok (int->String)
36         apply((int i) -> { return ""; }); // ok (int->String)
37         apply((int i) -> { }); // ok (int->V)
38         apply((int i) -> { return; }); // ok (int->V)
39         apply((int i) -> { if (cond) return; else return; }); // ok (int->V)
40         apply((int i) -> { if (cond) return "1"; else return "2"; }); // ok (int->String)
41     }
42 
43     void testImplicit(boolean cond) {
44         apply((i) -> ""); // error - no parameter types
45         apply((i) -> { return ""; }); // error - no parameter types
46         apply((i) -> { }); // error - no parameter types
47         apply((i) -> { return; }); // error - no parameter types
48         apply((i) -> { if (cond) return; else return; }); // error - no parameter types
49         apply((i) -> { if (cond) return "1"; else return "2"; }); // error - no parameter types
50     }
51 
52     void testImplicitVar(boolean cond) {
53         apply((var i) -> ""); // error - no parameter types
54         apply((var i) -> { return ""; }); // error - no parameter types
55         apply((var i) -> { }); // error - no parameter types
56         apply((var i) -> { return; }); // error - no parameter types
57         apply((var i) -> { if (cond) return; else return; }); // error - no parameter types
58         apply((var i) -> { if (cond) return "1"; else return "2"; }); // error - no parameter types
59     }
60 
61     void testBadInferredReturn(boolean cond) {
62         apply((int i) -> { if (cond) return; else return ""; }); // error - only one branch returns
63         apply((int i) -> { if (cond) { return "2"; } }); // error - one return, but body completes normally
64     }
65 
66     void testBadNullReturn(boolean cond) {
67         apply((int i) -> { return null; }); // error - null return - statement
68         apply((int i) -> null); // error - null return - expression
69         apply((int i) -> { return cond ? null : null; }); // error - null conditional return - statement
70         apply((int i) -> cond ? null : null); // error - null conditional return - expression
71     }
72 
73     void testBadLambdaReturn(boolean cond) {
74         apply((int i) -> { return () -> {}; }); // error - lambda return - statement
75         apply((int i) -> () -> {});; // error - lambda return - expression
76         apply((int i) -> { return cond ? () -> {} : () -> {}; }); // error - lambda conditional return - statement
77         apply((int i) -> cond ? () -> {} : () -> {}); // error - lambda conditional return - expression
78     }
79 
80     void testBadMrefReturn(boolean cond) {
81         apply((int i) -> { return this::mr; }); // error - mref return - statement
82         apply((int i) -> this::mr); // error - mref return - expression
83         apply((int i) -> { return cond ? this::mr : this::mr; }); // error - mref conditional return - statement
84         apply((int i) -> cond ? this::mr : this::mr); // error - mref conditional return - expression
85     }
86 
87     void mr() { }
88 
89     void apply(Quoted quoted) { }
90 }