ASM is smart enough to put all kinds of constants on stack, no need for custom logic

idea/src/org/jetbrains/jet/codegen/StackValue.java

@@ -96,18 +96,7 @@ public abstract class StackValue {
 
         @Override
         public void put(Type type, InstructionAdapter v) {
-            if (type == Type.INT_TYPE) {
-                if (value instanceof Number) {
-                    v.iconst(((Number) value).intValue());
-                }
-                else {
-                    throw new UnsupportedOperationException("don't know how to put this value");
-                }
-            }
-            // TODO other primitive types
-            else {
-                v.aconst(value);
-            }
+            v.aconst(value);
         }
 
         @Override

idea/tests/org/jetbrains/jet/codegen/NamespaceGenTest.java

@@ -269,6 +269,12 @@ public class NamespaceGenTest extends LightCodeInsightFixtureTestCase {
                 Byte.valueOf((byte) 126), Byte.valueOf((byte) 127), 1);
     }
 
+    public void testBooleanConstant() throws Exception {
+        loadText("fun foo(): Boolean = true");
+        final Method main = generateFunction();
+        assertEquals(true, main.invoke(null));
+    }
+
     private void binOpTest(final String text, final Object arg1, final Object arg2, final Object expected) throws Exception {
         loadText(text);
         System.out.println(generateToText());