From 5a20d91b53d7889a5be8ed9dabeccbac0371f121 Mon Sep 17 00:00:00 2001
From: John Hodge <tpg@mutabah.net>
Date: Sat, 22 Oct 2016 10:31:16 +0800
Subject: Expand - #[prelude_import] support

---
 src/expand/std_prelude.cpp | 20 +++++++++++++++++++-
 src/resolve/index.cpp      |  7 ++++---
 2 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/src/expand/std_prelude.cpp b/src/expand/std_prelude.cpp
index 4499dc6d..81eecf7f 100644
--- a/src/expand/std_prelude.cpp
+++ b/src/expand/std_prelude.cpp
@@ -52,11 +52,29 @@ public:
     }
 };
 
+class Decorator_PreludeImport:
+    public ExpandDecorator
+{
+public:
+    AttrStage stage() const override { return AttrStage::Post; }
+    
+    void handle(const Span& sp, const AST::MetaItem& mi, ::AST::Crate& crate, const AST::Path& path, AST::Module& mod, AST::Item&i) const override {
+        if( i.is_Use() ) {
+            const auto& p = i.as_Use().path;
+            // TODO: Ensure that this statement is a glob (has a name of "")
+            crate.m_prelude_path = AST::Path(p);
+        }
+        else {
+            ERROR(sp, E0000, "Invalid use of #[no_prelude] on non-module");
+        }
+    }
+};
 
 
 STATIC_DECORATOR("no_std", Decorator_NoStd)
 STATIC_DECORATOR("no_core", Decorator_NoCore)
-//STATIC_DECORATOR("prelude", Decorator_Prelude)
+//STATIC_DECORATOR("prelude", Decorator_Prelude)    // mrustc
+STATIC_DECORATOR("prelude_import", Decorator_PreludeImport)   // rustc
 
 STATIC_DECORATOR("no_prelude", Decorator_NoPrelude)
 
diff --git a/src/resolve/index.cpp b/src/resolve/index.cpp
index 39ae4ff2..66a9ec3d 100644
--- a/src/resolve/index.cpp
+++ b/src/resolve/index.cpp
@@ -404,11 +404,12 @@ void Resolve_Index_Module_Wildcard(AST::Crate& crate, AST::Module& mod, bool han
                     const auto& hmod = *e.hir;
                     Resolve_Index_Module_Wildcard__glob_in_hir_mod(sp, crate, mod, hmod, i_data.path, i.is_pub);
                 }
+                else if( e.module_ == &mod ) {
+                    // NOTE: Happens in libcore's prelude due to `#[prelude_import] use prelude::v1::*;
+                    //ERROR(sp, E0000, "Glob import of self");
+                }
                 else
                 {
-                    if( e.module_ == &mod ) {
-                        ERROR(sp, E0000, "Glob import of self");
-                    }
                     // 1. Begin indexing of this module if it is not already indexed
                     assert( e.module_->m_index_populated != 0 );
                     if( e.module_->m_index_populated == 1 )
-- 
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