letThrow as a convenient way to debug a try-catch expression

kiss/src/kiss/Macros.hx

@@ -594,6 +594,14 @@ class Macros {
         macros["once"] = once.bind("defvar");
         macros["oncePerInstance"] = once.bind("defprop");
 
+        // Replace "try" with this in a try-catch statement to let all exceptions throw
+        // their original call stacks. This is more convenient for debugging than trying to
+        // comment out the "try" and its catches, and re-balance parens
+        macros["letThrow"] = (wholeExp:ReaderExp, exps:Array<ReaderExp>, k:KissState) -> {
+            wholeExp.checkNumArgs(1, null, "(letThrow [thing] [catches...])");
+            exps[0];
+        };
+
         return macros;
     }
 

kiss/src/test/cases/BasicTestCase.hx

@@ -293,6 +293,10 @@ class BasicTestCase extends Test {
     function testVoid() {
         _testVoid();
     }
+
+    function testLetThrow() {
+        _testLetThrow();
+    }
 }
 
 class BasicObject {

kiss/src/test/cases/BasicTestCase.kiss

@@ -495,4 +495,14 @@
 (defun :Void myVoid [] (set voidRan true))
 (defun _testVoid []
     (myVoid)
-    (Assert.isTrue voidRan))
+    (Assert.isTrue voidRan))
+
+(defun _testLetThrow []
+    (try
+            {
+                (letThrow 
+                        (throw "the error we want")
+                    (catch [e] (Assert.fail)))
+                (Assert.fail)}
+        (catch [:String e]
+            (Assert.equals "the error we want" e))))