From 6ed590cce27edbdcc13cdd478d8a68c81da44596 Mon Sep 17 00:00:00 2001
From: John Hodge <tpg@mutabah.net>
Date: Wed, 24 Aug 2016 19:49:10 +0800
Subject: AST - More defensive `self: Box<Self>` code

---
 src/ast/ast.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'src/ast/ast.cpp')

diff --git a/src/ast/ast.cpp b/src/ast/ast.cpp
index 80182f85..70a61b32 100644
--- a/src/ast/ast.cpp
+++ b/src/ast/ast.cpp
@@ -320,6 +320,9 @@ Function::Function(Span sp, GenericParams params, TypeRef ret_type, Arglist args
             TU_IFLET( ::AST::Path::Class, e.path.m_class, Relative, pe,
                 if( pe.nodes.size() == 1 && pe.nodes.front().name() == "Box" )
                 {
+                    if( pe.nodes.front().args().m_types.size() != 1 ) {
+                        ERROR(sp, E0000, "Box takes 1 argument - " << ty);
+                    }
                     // HACK: Assumes that the param is Self or equivalent
                     m_receiver = Receiver::Box;
                 }
-- 
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