From 9091565b688cd9af550db83cee45f82c1c965ee1 Mon Sep 17 00:00:00 2001
From: hsfzxjy <hsfzxjy@gmail.com>
Date: Sun, 7 Feb 2021 17:55:59 +0800
Subject: [PATCH] Fix bug: default 'except_' should appear at last

---
 lambdex/compiler/rules.py | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/lambdex/compiler/rules.py b/lambdex/compiler/rules.py
index f5550bf..3019bc2 100644
--- a/lambdex/compiler/rules.py
+++ b/lambdex/compiler/rules.py
@@ -287,6 +287,7 @@ def r_try(node: ast.Subscript, ctx: Context, clauses: list):
     handlers = []
     orelse_body = []
     final_body = []
+    default_except_clause = None
     for clause in clauses[1:]:
         if clause.name == 'except_':
             ctx.assert_(
@@ -298,8 +299,14 @@ def r_try(node: ast.Subscript, ctx: Context, clauses: list):
             if clause.no_head():
                 # bare except
                 type_ = name = None
+                default_except_clause = clause
             else:
                 # except with capturing
+                ctx.assert_(
+                    default_except_clause is None,
+                    "default 'except_' must be last",
+                    lambda: default_except_clause.node,
+                )
                 ctx.assert_single_head(clause)
                 type_, name = check_as(ctx, clause.unwrap_head(), ast.Gt, rhs_is_identifier=True)