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-rw-r--r--src/libsyntax/ext/deriving/mod.rs2
-rw-r--r--src/libsyntax/ext/deriving/show.rs4
-rw-r--r--src/libsyntax/ext/format.rs4
3 files changed, 6 insertions, 4 deletions
diff --git a/src/libsyntax/ext/deriving/mod.rs b/src/libsyntax/ext/deriving/mod.rs
index 603c4478007..e52a2b513ce 100644
--- a/src/libsyntax/ext/deriving/mod.rs
+++ b/src/libsyntax/ext/deriving/mod.rs
@@ -99,7 +99,9 @@ pub fn expand_meta_derive(cx: &mut ExtCtxt,
 
                             "Rand" => expand!(rand::expand_deriving_rand),
 
+                            // NOTE(stage0): remove "Show"
                             "Show" => expand!(show::expand_deriving_show),
+                            "Debug" => expand!(show::expand_deriving_show),
 
                             "Default" => expand!(default::expand_deriving_default),
 
diff --git a/src/libsyntax/ext/deriving/show.rs b/src/libsyntax/ext/deriving/show.rs
index 48034ce50ab..f5b5d4dda19 100644
--- a/src/libsyntax/ext/deriving/show.rs
+++ b/src/libsyntax/ext/deriving/show.rs
@@ -35,7 +35,7 @@ pub fn expand_deriving_show<F>(cx: &mut ExtCtxt,
     let trait_def = TraitDef {
         span: span,
         attributes: Vec::new(),
-        path: Path::new(vec!("std", "fmt", "Show")),
+        path: Path::new(vec!("std", "fmt", "Debug")),
         additional_bounds: Vec::new(),
         generics: LifetimeBounds::empty(),
         methods: vec!(
@@ -67,7 +67,7 @@ fn show_substructure(cx: &mut ExtCtxt, span: Span,
         Struct(_) => substr.type_ident,
         EnumMatching(_, v, _) => v.node.name,
         EnumNonMatchingCollapsed(..) | StaticStruct(..) | StaticEnum(..) => {
-            cx.span_bug(span, "nonsensical .fields in `#[derive(Show)]`")
+            cx.span_bug(span, "nonsensical .fields in `#[derive(Debug)]`")
         }
     };
 
diff --git a/src/libsyntax/ext/format.rs b/src/libsyntax/ext/format.rs
index f512b33f024..84f2ef0678d 100644
--- a/src/libsyntax/ext/format.rs
+++ b/src/libsyntax/ext/format.rs
@@ -603,8 +603,8 @@ impl<'a, 'b> Context<'a, 'b> {
         let trait_ = match *ty {
             Known(ref tyname) => {
                 match &tyname[] {
-                    ""  => "String",
-                    "?" => "Show",
+                    ""  => "Display",
+                    "?" => "Debug",
                     "e" => "LowerExp",
                     "E" => "UpperExp",
                     "o" => "Octal",