Fixing catch a bit to now force a param.

bin/py2ast

@@ -0,0 +1,7 @@
+#!/usr/bin/env python
+
+import sys
+import ast
+
+
+print(ast.dump(ast.parse(open(sys.argv[1], 'r').read())))

hy/compiler.py

@@ -105,6 +105,7 @@ class HyASTCompiler(object):
         expr.pop(0)  # try
 
         if sys.version_info[0] >= 3 and sys.version_info[1] >= 3:
+            # Python 3.3 features a rename of TryExcept to Try.
             Try = ast.Try
         else:
             Try = ast.TryExcept
@@ -120,12 +121,27 @@ class HyASTCompiler(object):
     @builds("catch")
     def compile_catch_expression(self, expr):
         expr.pop(0)  # catch
+        _type = self.compile(expr.pop(0))
+        name = expr.pop(0)
+
+        if sys.version_info[0] >= 3:
+            # Python3 features a change where the Exception handler
+            # moved the name from a Name() to a pure Python String type.
+            #
+            # We'll just make sure it's a pure "string", and let it work
+            # it's magic.
+            name = str(name)
+        else:
+            # Python2 requires an ast.Name, set to ctx Store.
+            name = self.compile(name)
+            name.ctx = ast.Store()
+
         return ast.ExceptHandler(
             lineno=expr.start_line,
             col_offset=expr.start_column,
-            type=self.compile(expr.pop(0)),
-            name=None,
-            body=self._code_branch(self.compile(expr.pop(0))))
+            type=_type,
+            name=name,
+            body=self._code_branch([self.compile(x) for x in expr]))
 
     def _code_branch(self, branch):
         if isinstance(branch, list):
@@ -465,7 +481,9 @@ class HyASTCompiler(object):
                 ctx=ast.Load()
             )
 
-        return ast.Name(id=str(symbol), ctx=ast.Load(),
+        return ast.Name(id=str(symbol),
+                        arg=str(symbol),
+                        ctx=ast.Load(),
                         lineno=symbol.start_line,
                         col_offset=symbol.start_column)
 

site/app.hy

@@ -28,6 +28,6 @@
 (post-route "/hy2py" []
   (try
     (hy-to-py (get request.form "code"))
-  (catch LexException (err "Incomplete Code."))
-  (catch HyError (err "Generic error during processing."))
-  (catch Exception (err "Erm, you broke something."))))
+  (catch LexException e (err "Incomplete Code."))
+  (catch HyError e (err "Generic error during processing."))
+  (catch Exception e (err "Erm, you broke something."))))

tests/native_tests/language.hy

@@ -123,10 +123,8 @@
   "NATIVE: test Exceptions"
   (try
     (throw (KeyError))
-    (catch IOError  (assert (= 2 1)))
-    (catch KeyError (do
-                      (+ 1 1)
-                      (assert (= 1 1))))))
+  (catch IOError  e (assert (= 2 1)))
+  (catch KeyError e (+ 1 1) (assert (= 1 1)))))
 
 (defn test-earmuffs []
   "NATIVE: Test earmuffs"