Better message for long constants.

js/js.tests/test/org/jetbrains/k2js/test/semantics/NumberTest.java

@@ -16,6 +16,8 @@
 
 package org.jetbrains.k2js.test.semantics;
 
+import junit.framework.Assert;
+import org.jetbrains.k2js.facade.exceptions.TranslationInternalException;
 import org.jetbrains.k2js.test.SingleFileTranslationTest;
 
 /**
@@ -45,4 +47,14 @@ public final class NumberTest extends SingleFileTranslationTest {
     public void testDivision() throws Exception {
         fooBoxIsValue("SUCCESS");
     }
+
+    public void testHexademicalConstant() throws Exception {
+        try {
+            fooBoxTest();
+        } catch (TranslationInternalException e) {
+            Throwable cause = e.getCause();
+            Assert.assertTrue(cause instanceof IllegalStateException);
+            Assert.assertTrue(cause.getMessage().startsWith("Unsupported long constant "));
+        }
+    }
 }

js/js.translator/src/org/jetbrains/k2js/translate/expression/ExpressionVisitor.java

@@ -89,8 +89,10 @@ public final class ExpressionVisitor extends TranslatorVisitor<JsNode> {
         if (value instanceof Short) {
             return context.program().getNumberLiteral((Short) value);
         }
-        //TODO: long and char
-        throw new AssertionError(message(expression, "Unsupported constant expression"));
+        if (value instanceof Long) {
+            throw new IllegalStateException(message(expression, "Unsupported long constant"));
+        }
+        throw new IllegalStateException(message(expression, "Unsupported constant expression"));
     }
 
     @Override

js/js.translator/testFiles/number/cases/hexademicalConstant.kt

@@ -0,0 +1,4 @@
+fun box(): Boolean {
+    val i = 0x80000000 + 0x8000000
+    return true
+}