WIP show block calling a reportGetVar

src/blocks.js

@@ -4196,13 +4196,18 @@ BlockMorph.prototype.errorPic = function () {
     // return a picture of myself, that approximately fits in "one line"
     // filter any blocks beneath me, so that users only see the first
     // block that caused an error.
-    if (this.nextBlock) {
-        var copy = this.fullCopy();
+    var block = this;
+    if (block.selector === 'reportGetVar') {
+        // if I am a single variable, show my caller in the output.
+        block = block.parent;
+    }
+    if (block.nextBlock) {
+        var copy = block.fullCopy();
         copy.removeChild(copy.nextBlock());
         return copy.fullImage();
     }
 
-    return this.fullImage();
+    return block.fullImage();
 }
 
 BlockMorph.prototype.fullImage = function () {

src/threads.js

@@ -1176,9 +1176,9 @@ Process.prototype.errorBubble = function (error, element) {
     // above the text of error.
     var errorMorph = new AlignmentMorph('column', 5),
         errorIsNested = isNil(element.world()),
-        errorPrefix = errorIsNested ? localize('Inside a custom block') + ':\n' : '',
+        errorPrefix = errorIsNested ? `${localize('Inside a custom block')}:\n`: '',
         errorMessage = new TextMorph(
-            errorPrefix + localize(error.name) + ':\n' + error.message,
+            `${errorPrefix}${localize(error.name)}:\n${localize(error.message)}`,
             SyntaxElementMorph.prototype.fontSize
         ),
         img, blockImage;
@@ -1186,22 +1186,13 @@ Process.prototype.errorBubble = function (error, element) {
     errorMorph.add(errorMessage);
     errorMorph.alpha = 0;
     if (errorIsNested) {
-        window.element = element;
+        errorMorph.text += `\n${localize('The error occured at:')}\n`;
         img = element.errorPic();
         blockImage = new Morph();
         blockImage.isCachingImage = true;
-        blockImage.bounds.setWidth(img.width);
-        blockImage.bounds.setHeight(img.height);
-
-        // blockImage.setExtent(new Point(img.width, img.height));
+        blockImage.setExtent(new Point(img.width, img.height));
         blockImage.cachedImage = img;
-        // blockImage.image = img;
-        // errorMessage.setTop(blockImage.height() + 2);
         errorMorph.add(blockImage);
-        // errorMorph.setExtent(new Point(
-        //     Math.max(blockImage.width(), errorMessage.width()),
-        //     blockImage.height() + errorMessage.height()
-        // ));
         errorMorph.fixLayout();
     }