From 623c8a2542cf071b59aebe4811d7d61c762db774 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sun, 27 Aug 2023 20:27:49 +0100
Subject: Check while loop body does not yield value

---
 .../compiler/typechecker/TypeCheckerWhileTests.java     | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'src/test/java')

diff --git a/src/test/java/org/shedlang/compiler/typechecker/TypeCheckerWhileTests.java b/src/test/java/org/shedlang/compiler/typechecker/TypeCheckerWhileTests.java
index 209be5e1..5fc029b8 100644
--- a/src/test/java/org/shedlang/compiler/typechecker/TypeCheckerWhileTests.java
+++ b/src/test/java/org/shedlang/compiler/typechecker/TypeCheckerWhileTests.java
@@ -2,6 +2,7 @@ package org.shedlang.compiler.typechecker;
 
 import org.junit.jupiter.api.Test;
 import org.shedlang.compiler.ast.untyped.Untyped;
+import org.shedlang.compiler.typechecker.errors.LoopBodyCannotYieldValueError;
 import org.shedlang.compiler.typechecker.errors.UnexpectedTypeError;
 import org.shedlang.compiler.typechecker.typesets.TypeSets;
 import org.shedlang.compiler.types.Types;
@@ -66,4 +67,20 @@ public class TypeCheckerWhileTests {
             ))
         ));
     }
+
+    @Test
+    public void bodyCannotReturnValueFromBlock() {
+        var untyped = Untyped.while_(
+            Untyped.boolLiteral(true),
+            Untyped.block(List.of(
+                Untyped.blockReturn(Untyped.intLiteral(42))
+            ))
+        );
+        var context = TypeCheckerContext.EMPTY;
+
+        assertThrows(
+            LoopBodyCannotYieldValueError.class,
+            () -> TypeChecker.typeCheckFunctionStatement(untyped, context)
+        );
+    }
 }
-- 
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