mrustc-0.9.0 fails to compile out of the box:
src/common.hpp:268:28: error: cannot increment value of type
      'std::__1::__wrap_iter<const AST::Attribute *>'

This patch fixes the code so that it compiles.

diff --git a/src/ast/ast.cpp b/src/ast/ast.cpp
index 827ac2d..4cb0061 100644
--- a/src/ast/ast.cpp
+++ b/src/ast/ast.cpp
@@ -47,6 +47,13 @@ const Attribute* AttributeList::get(const char *name) const
     return 0;
 }
 
+::std::ostream& operator<<(::std::ostream& os, const AttributeList& x) {
+    for(const auto& i : x.m_items) {
+        os << "#[" << i << "]";
+    }
+    return os;
+}
+
 Attribute Attribute::clone() const
 {
     TU_MATCHA( (m_data), (e),
diff --git a/src/ast/attrs.hpp b/src/ast/attrs.hpp
index 7a6ce86..452debb 100644
--- a/src/ast/attrs.hpp
+++ b/src/ast/attrs.hpp
@@ -12,48 +12,6 @@
 
 //
 class Attribute;
-::std::ostream& operator<<(::std::ostream& os, const Attribute& x);
-
-/// A list of attributes on an item (searchable by the attribute name)
-class AttributeList
-{
-public:
-    ::std::vector<Attribute> m_items;
-
-    AttributeList() {}
-    AttributeList(::std::vector<Attribute> items):
-        m_items( mv$(items) )
-    {
-    }
-
-    // Move present
-    AttributeList(AttributeList&&) = default;
-    AttributeList& operator=(AttributeList&&) = default;
-    // No copy assign, but explicit copy
-    explicit AttributeList(const AttributeList&) = default;
-    AttributeList& operator=(const AttributeList&) = delete;
-    // Explicit clone
-    AttributeList clone() const;
-
-    void push_back(Attribute i);
-
-    const Attribute* get(const char *name) const;
-    Attribute* get(const char *name) {
-        return const_cast<Attribute*>( const_cast<const AttributeList*>(this)->get(name));
-    }
-    bool has(const char *name) const {
-        return get(name) != 0;
-    }
-
-    friend ::std::ostream& operator<<(::std::ostream& os, const AttributeList& x) {
-        for(const auto& i : x.m_items) {
-            os << "#[" << i << "]";
-        }
-        return os;
-    }
-};
-
-
 TAGGED_UNION(AttributeData, None,
     (None, struct {}),
     (String, struct {
@@ -153,7 +99,42 @@ public:
     }
 };
 
+::std::ostream& operator<<(::std::ostream& os, const Attribute& x);
+
+/// A list of attributes on an item (searchable by the attribute name)
+class AttributeList
+{
+public:
+    ::std::vector<Attribute> m_items;
+
+    AttributeList() {}
+    AttributeList(::std::vector<Attribute> items):
+        m_items( mv$(items) )
+    {
+    }
+
+    // Move present
+    AttributeList(AttributeList&&) = default;
+    AttributeList& operator=(AttributeList&&) = default;
+    // No copy assign, but explicit copy
+    explicit AttributeList(const AttributeList&) = default;
+    AttributeList& operator=(const AttributeList&) = delete;
+    // Explicit clone
+    AttributeList clone() const;
+
+    void push_back(Attribute i);
+
+    const Attribute* get(const char *name) const;
+    Attribute* get(const char *name) {
+        return const_cast<Attribute*>( const_cast<const AttributeList*>(this)->get(name));
+    }
+    bool has(const char *name) const {
+        return get(name) != 0;
+    }
+};
+
+::std::ostream& operator<<(::std::ostream& os, const AttributeList& x);
+
 }   // namespace AST
 
 #endif
-