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-rw-r--r--src/libsyntax/abi.rs6
-rw-r--r--src/libsyntax/ast.rs192
-rw-r--r--src/libsyntax/ast_map/mod.rs8
-rw-r--r--src/libsyntax/ast_util.rs2
-rw-r--r--src/libsyntax/attr.rs8
-rw-r--r--src/libsyntax/codemap.rs16
-rw-r--r--src/libsyntax/diagnostic.rs2
-rw-r--r--src/libsyntax/ext/base.rs2
-rw-r--r--src/libsyntax/ext/deriving/generic/mod.rs2
-rw-r--r--src/libsyntax/ext/mtwt.rs4
-rw-r--r--src/libsyntax/parse/lexer/mod.rs2
-rw-r--r--src/libsyntax/parse/token.rs12
12 files changed, 128 insertions, 128 deletions
diff --git a/src/libsyntax/abi.rs b/src/libsyntax/abi.rs
index 5f593ac7081..2325b3778c7 100644
--- a/src/libsyntax/abi.rs
+++ b/src/libsyntax/abi.rs
@@ -15,7 +15,7 @@ pub use self::AbiArchitecture::*;
 
 use std::fmt;
 
-#[derive(Copy, PartialEq, Eq, Show)]
+#[derive(Copy, PartialEq, Eq, Debug)]
 pub enum Os {
     OsWindows,
     OsMacos,
@@ -26,7 +26,7 @@ pub enum Os {
     OsDragonfly,
 }
 
-#[derive(PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Clone, Copy, Show)]
+#[derive(PartialEq, Eq, Hash, RustcEncodable, RustcDecodable, Clone, Copy, Debug)]
 pub enum Abi {
     // NB: This ordering MUST match the AbiDatas array below.
     // (This is ensured by the test indices_are_correct().)
@@ -47,7 +47,7 @@ pub enum Abi {
 }
 
 #[allow(non_camel_case_types)]
-#[derive(Copy, PartialEq, Show)]
+#[derive(Copy, PartialEq, Debug)]
 pub enum Architecture {
     X86,
     X86_64,
diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
index 4dada5bc81e..11068880b0e 100644
--- a/src/libsyntax/ast.rs
+++ b/src/libsyntax/ast.rs
@@ -208,14 +208,14 @@ impl Decodable for Ident {
 pub type FnIdent = Option<Ident>;
 
 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash,
-           Show, Copy)]
+           Debug, Copy)]
 pub struct Lifetime {
     pub id: NodeId,
     pub span: Span,
     pub name: Name
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct LifetimeDef {
     pub lifetime: Lifetime,
     pub bounds: Vec<Lifetime>
@@ -224,7 +224,7 @@ pub struct LifetimeDef {
 /// A "Path" is essentially Rust's notion of a name; for instance:
 /// std::cmp::PartialEq  .  It's represented as a sequence of identifiers,
 /// along with a bunch of supporting information.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Path {
     pub span: Span,
     /// A `::foo` path, is relative to the crate root rather than current
@@ -236,7 +236,7 @@ pub struct Path {
 
 /// A segment of a path: an identifier, an optional lifetime, and a set of
 /// types.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct PathSegment {
     /// The identifier portion of this path segment.
     pub identifier: Ident,
@@ -249,7 +249,7 @@ pub struct PathSegment {
     pub parameters: PathParameters,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum PathParameters {
     AngleBracketedParameters(AngleBracketedParameterData),
     ParenthesizedParameters(ParenthesizedParameterData),
@@ -327,7 +327,7 @@ impl PathParameters {
 }
 
 /// A path like `Foo<'a, T>`
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct AngleBracketedParameterData {
     /// The lifetime parameters for this path segment.
     pub lifetimes: Vec<Lifetime>,
@@ -345,7 +345,7 @@ impl AngleBracketedParameterData {
 }
 
 /// A path like `Foo(A,B) -> C`
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct ParenthesizedParameterData {
     /// Overall span
     pub span: Span,
@@ -362,7 +362,7 @@ pub type CrateNum = u32;
 pub type NodeId = u32;
 
 #[derive(Clone, Eq, Ord, PartialOrd, PartialEq, RustcEncodable,
-           RustcDecodable, Hash, Show, Copy)]
+           RustcDecodable, Hash, Debug, Copy)]
 pub struct DefId {
     pub krate: CrateNum,
     pub node: NodeId,
@@ -382,7 +382,7 @@ pub const DUMMY_NODE_ID: NodeId = -1;
 /// typeck::collect::compute_bounds matches these against
 /// the "special" built-in traits (see middle::lang_items) and
 /// detects Copy, Send and Sync.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum TyParamBound {
     TraitTyParamBound(PolyTraitRef, TraitBoundModifier),
     RegionTyParamBound(Lifetime)
@@ -390,7 +390,7 @@ pub enum TyParamBound {
 
 /// A modifier on a bound, currently this is only used for `?Sized`, where the
 /// modifier is `Maybe`. Negative bounds should also be handled here.
-#[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum TraitBoundModifier {
     None,
     Maybe,
@@ -398,7 +398,7 @@ pub enum TraitBoundModifier {
 
 pub type TyParamBounds = OwnedSlice<TyParamBound>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct TyParam {
     pub ident: Ident,
     pub id: NodeId,
@@ -409,7 +409,7 @@ pub struct TyParam {
 
 /// Represents lifetimes and type parameters attached to a declaration
 /// of a function, enum, trait, etc.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Generics {
     pub lifetimes: Vec<LifetimeDef>,
     pub ty_params: OwnedSlice<TyParam>,
@@ -428,34 +428,34 @@ impl Generics {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct WhereClause {
     pub id: NodeId,
     pub predicates: Vec<WherePredicate>,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum WherePredicate {
     BoundPredicate(WhereBoundPredicate),
     RegionPredicate(WhereRegionPredicate),
     EqPredicate(WhereEqPredicate)
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct WhereBoundPredicate {
     pub span: Span,
     pub bounded_ty: P<Ty>,
     pub bounds: OwnedSlice<TyParamBound>,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct WhereRegionPredicate {
     pub span: Span,
     pub lifetime: Lifetime,
     pub bounds: Vec<Lifetime>,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct WhereEqPredicate {
     pub id: NodeId,
     pub span: Span,
@@ -467,7 +467,7 @@ pub struct WhereEqPredicate {
 /// used to drive conditional compilation
 pub type CrateConfig = Vec<P<MetaItem>> ;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Crate {
     pub module: Mod,
     pub attrs: Vec<Attribute>,
@@ -478,7 +478,7 @@ pub struct Crate {
 
 pub type MetaItem = Spanned<MetaItem_>;
 
-#[derive(Clone, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum MetaItem_ {
     MetaWord(InternedString),
     MetaList(InternedString, Vec<P<MetaItem>>),
@@ -510,7 +510,7 @@ impl PartialEq for MetaItem_ {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Block {
     pub stmts: Vec<P<Stmt>>,
     pub expr: Option<P<Expr>>,
@@ -519,27 +519,27 @@ pub struct Block {
     pub span: Span,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Pat {
     pub id: NodeId,
     pub node: Pat_,
     pub span: Span,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct FieldPat {
     pub ident: Ident,
     pub pat: P<Pat>,
     pub is_shorthand: bool,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum BindingMode {
     BindByRef(Mutability),
     BindByValue(Mutability),
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum PatWildKind {
     /// Represents the wildcard pattern `_`
     PatWildSingle,
@@ -548,7 +548,7 @@ pub enum PatWildKind {
     PatWildMulti,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Pat_ {
     /// Represents a wildcard pattern (either `_` or `..`)
     PatWild(PatWildKind),
@@ -577,13 +577,13 @@ pub enum Pat_ {
     PatMac(Mac),
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum Mutability {
     MutMutable,
     MutImmutable,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum BinOp_ {
     BiAdd,
     BiSub,
@@ -607,7 +607,7 @@ pub enum BinOp_ {
 
 pub type BinOp = Spanned<BinOp_>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum UnOp {
     UnUniq,
     UnDeref,
@@ -617,7 +617,7 @@ pub enum UnOp {
 
 pub type Stmt = Spanned<Stmt_>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Stmt_ {
     /// Could be an item or a local (let) binding:
     StmtDecl(P<Decl>, NodeId),
@@ -631,7 +631,7 @@ pub enum Stmt_ {
     StmtMac(P<Mac>, MacStmtStyle),
 }
 
-#[derive(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum MacStmtStyle {
     /// The macro statement had a trailing semicolon, e.g. `foo! { ... };`
     /// `foo!(...);`, `foo![...];`
@@ -646,7 +646,7 @@ pub enum MacStmtStyle {
 
 /// Where a local declaration came from: either a true `let ... =
 /// ...;`, or one desugared from the pattern of a for loop.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum LocalSource {
     LocalLet,
     LocalFor,
@@ -655,7 +655,7 @@ pub enum LocalSource {
 // FIXME (pending discussion of #1697, #2178...): local should really be
 // a refinement on pat.
 /// Local represents a `let` statement, e.g., `let <pat>:<ty> = <expr>;`
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Local {
     pub pat: P<Pat>,
     pub ty: Option<P<Ty>>,
@@ -667,7 +667,7 @@ pub struct Local {
 
 pub type Decl = Spanned<Decl_>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Decl_ {
     /// A local (let) binding:
     DeclLocal(P<Local>),
@@ -676,7 +676,7 @@ pub enum Decl_ {
 }
 
 /// represents one arm of a 'match'
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Arm {
     pub attrs: Vec<Attribute>,
     pub pats: Vec<P<Pat>>,
@@ -684,7 +684,7 @@ pub struct Arm {
     pub body: P<Expr>,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Field {
     pub ident: SpannedIdent,
     pub expr: P<Expr>,
@@ -693,26 +693,26 @@ pub struct Field {
 
 pub type SpannedIdent = Spanned<Ident>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum BlockCheckMode {
     DefaultBlock,
     UnsafeBlock(UnsafeSource),
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum UnsafeSource {
     CompilerGenerated,
     UserProvided,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Expr {
     pub id: NodeId,
     pub node: Expr_,
     pub span: Span,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Expr_ {
     /// First expr is the place; second expr is the value.
     ExprBox(Option<P<Expr>>, P<Expr>),
@@ -776,28 +776,28 @@ pub enum Expr_ {
 ///     <Vec<T> as SomeTrait>::SomeAssociatedItem
 ///      ^~~~~     ^~~~~~~~~   ^~~~~~~~~~~~~~~~~~
 ///      self_type  trait_name  item_path
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct QPath {
     pub self_type: P<Ty>,
     pub trait_ref: P<TraitRef>,
     pub item_path: PathSegment,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum MatchSource {
     Normal,
     IfLetDesugar { contains_else_clause: bool },
     WhileLetDesugar,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum CaptureClause {
     CaptureByValue,
     CaptureByRef,
 }
 
 /// A delimited sequence of token trees
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Delimited {
     /// The type of delimiter
     pub delim: token::DelimToken,
@@ -832,7 +832,7 @@ impl Delimited {
 }
 
 /// A sequence of token treesee
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct SequenceRepetition {
     /// The sequence of token trees
     pub tts: Vec<TokenTree>,
@@ -846,7 +846,7 @@ pub struct SequenceRepetition {
 
 /// A Kleene-style [repetition operator](http://en.wikipedia.org/wiki/Kleene_star)
 /// for token sequences.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum KleeneOp {
     ZeroOrMore,
     OneOrMore,
@@ -864,7 +864,7 @@ pub enum KleeneOp {
 ///
 /// The RHS of an MBE macro is the only place `SubstNt`s are substituted.
 /// Nothing special happens to misnamed or misplaced `SubstNt`s.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 #[doc="For macro invocations; parsing is delegated to the macro"]
 pub enum TokenTree {
     /// A single token
@@ -955,14 +955,14 @@ pub type Mac = Spanned<Mac_>;
 /// is being invoked, and the vector of token-trees contains the source
 /// of the macro invocation.
 /// There's only one flavor, now, so this could presumably be simplified.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Mac_ {
     // NB: the additional ident for a macro_rules-style macro is actually
     // stored in the enclosing item. Oog.
     MacInvocTT(Path, Vec<TokenTree>, SyntaxContext),   // new macro-invocation
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum StrStyle {
     CookedStr,
     RawStr(usize)
@@ -970,7 +970,7 @@ pub enum StrStyle {
 
 pub type Lit = Spanned<Lit_>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum Sign {
     Minus,
     Plus
@@ -986,7 +986,7 @@ impl Sign {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum LitIntType {
     SignedIntLit(IntTy, Sign),
     UnsignedIntLit(UintTy),
@@ -1003,7 +1003,7 @@ impl LitIntType {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Lit_ {
     LitStr(InternedString, StrStyle),
     LitBinary(Rc<Vec<u8>>),
@@ -1017,13 +1017,13 @@ pub enum Lit_ {
 
 // NB: If you change this, you'll probably want to change the corresponding
 // type structure in middle/ty.rs as well.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct MutTy {
     pub ty: P<Ty>,
     pub mutbl: Mutability,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct TypeField {
     pub ident: Ident,
     pub mt: MutTy,
@@ -1032,7 +1032,7 @@ pub struct TypeField {
 
 /// Represents a required method in a trait declaration,
 /// one without a default implementation
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct TypeMethod {
     pub ident: Ident,
     pub attrs: Vec<Attribute>,
@@ -1050,26 +1050,26 @@ pub struct TypeMethod {
 /// a default implementation A trait method is either required (meaning it
 /// doesn't have an implementation, just a signature) or provided (meaning it
 /// has a default implementation).
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum TraitItem {
     RequiredMethod(TypeMethod),
     ProvidedMethod(P<Method>),
     TypeTraitItem(P<AssociatedType>),
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum ImplItem {
     MethodImplItem(P<Method>),
     TypeImplItem(P<Typedef>),
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct AssociatedType {
     pub attrs: Vec<Attribute>,
     pub ty_param: TyParam,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Typedef {
     pub id: NodeId,
     pub span: Span,
@@ -1196,7 +1196,7 @@ impl FloatTy {
 }
 
 // Bind a type to an associated type: `A=Foo`.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct TypeBinding {
     pub id: NodeId,
     pub ident: Ident,
@@ -1206,7 +1206,7 @@ pub struct TypeBinding {
 
 
 // NB PartialEq method appears below.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Ty {
     pub id: NodeId,
     pub node: Ty_,
@@ -1214,7 +1214,7 @@ pub struct Ty {
 }
 
 /// Not represented directly in the AST, referred to by name through a ty_path.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum PrimTy {
     TyInt(IntTy),
     TyUint(UintTy),
@@ -1224,7 +1224,7 @@ pub enum PrimTy {
     TyChar
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct BareFnTy {
     pub unsafety: Unsafety,
     pub abi: Abi,
@@ -1232,7 +1232,7 @@ pub struct BareFnTy {
     pub decl: P<FnDecl>
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 /// The different kinds of types recognized by the compiler
 pub enum Ty_ {
     TyVec(P<Ty>),
@@ -1265,13 +1265,13 @@ pub enum Ty_ {
     TyInfer,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum AsmDialect {
     AsmAtt,
     AsmIntel
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct InlineAsm {
     pub asm: InternedString,
     pub asm_str_style: StrStyle,
@@ -1285,7 +1285,7 @@ pub struct InlineAsm {
 }
 
 /// represents an argument in a function header
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Arg {
     pub ty: P<Ty>,
     pub pat: P<Pat>,
@@ -1313,14 +1313,14 @@ impl Arg {
 }
 
 /// represents the header (not the body) of a function declaration
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct FnDecl {
     pub inputs: Vec<Arg>,
     pub output: FunctionRetTy,
     pub variadic: bool
 }
 
-#[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Copy, Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Unsafety {
     Unsafe,
     Normal,
@@ -1353,7 +1353,7 @@ impl fmt::Debug for ImplPolarity {
 }
 
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum FunctionRetTy {
     /// Functions with return type ! that always
     /// raise an error or exit (i.e. never return to the caller)
@@ -1377,7 +1377,7 @@ impl FunctionRetTy {
 }
 
 /// Represents the kind of 'self' associated with a method
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum ExplicitSelf_ {
     /// No self
     SelfStatic,
@@ -1391,7 +1391,7 @@ pub enum ExplicitSelf_ {
 
 pub type ExplicitSelf = Spanned<ExplicitSelf_>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Method {
     pub attrs: Vec<Attribute>,
     pub id: NodeId,
@@ -1399,7 +1399,7 @@ pub struct Method {
     pub node: Method_,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Method_ {
     /// Represents a method declaration
     MethDecl(Ident,
@@ -1414,7 +1414,7 @@ pub enum Method_ {
     MethMac(Mac),
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Mod {
     /// A span from the first token past `{` to the last token until `}`.
     /// For `mod foo;`, the inner span ranges from the first token
@@ -1423,30 +1423,30 @@ pub struct Mod {
     pub items: Vec<P<Item>>,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct ForeignMod {
     pub abi: Abi,
     pub items: Vec<P<ForeignItem>>,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct VariantArg {
     pub ty: P<Ty>,
     pub id: NodeId,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum VariantKind {
     TupleVariantKind(Vec<VariantArg>),
     StructVariantKind(P<StructDef>),
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct EnumDef {
     pub variants: Vec<P<Variant>>,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Variant_ {
     pub name: Ident,
     pub attrs: Vec<Attribute>,
@@ -1458,7 +1458,7 @@ pub struct Variant_ {
 
 pub type Variant = Spanned<Variant_>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum PathListItem_ {
     PathListIdent { name: Ident, id: NodeId },
     PathListMod { id: NodeId }
@@ -1476,7 +1476,7 @@ pub type PathListItem = Spanned<PathListItem_>;
 
 pub type ViewPath = Spanned<ViewPath_>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum ViewPath_ {
 
     /// `foo::bar::baz as quux`
@@ -1499,17 +1499,17 @@ pub type Attribute = Spanned<Attribute_>;
 /// Distinguishes between Attributes that decorate items and Attributes that
 /// are contained as statements within items. These two cases need to be
 /// distinguished for pretty-printing.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum AttrStyle {
     AttrOuter,
     AttrInner,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub struct AttrId(pub usize);
 
 /// Doc-comments are promoted to attributes that have is_sugared_doc = true
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Attribute_ {
     pub id: AttrId,
     pub style: AttrStyle,
@@ -1522,13 +1522,13 @@ pub struct Attribute_ {
 /// that the ref_id is for. The impl_id maps to the "self type" of this impl.
 /// If this impl is an ItemImpl, the impl_id is redundant (it could be the
 /// same as the impl's node id).
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct TraitRef {
     pub path: Path,
     pub ref_id: NodeId,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct PolyTraitRef {
     /// The `'a` in `<'a> Foo<&'a T>`
     pub bound_lifetimes: Vec<LifetimeDef>,
@@ -1537,7 +1537,7 @@ pub struct PolyTraitRef {
     pub trait_ref: TraitRef,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum Visibility {
     Public,
     Inherited,
@@ -1552,7 +1552,7 @@ impl Visibility {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct StructField_ {
     pub kind: StructFieldKind,
     pub id: NodeId,
@@ -1571,7 +1571,7 @@ impl StructField_ {
 
 pub type StructField = Spanned<StructField_>;
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum StructFieldKind {
     NamedField(Ident, Visibility),
     /// Element of a tuple-like struct
@@ -1587,7 +1587,7 @@ impl StructFieldKind {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct StructDef {
     /// Fields, not including ctor
     pub fields: Vec<StructField>,
@@ -1600,7 +1600,7 @@ pub struct StructDef {
   FIXME (#3300): Should allow items to be anonymous. Right now
   we just use dummy names for anon items.
  */
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Item {
     pub ident: Ident,
     pub attrs: Vec<Attribute>,
@@ -1610,7 +1610,7 @@ pub struct Item {
     pub span: Span,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum Item_ {
     // Optional location (containing arbitrary characters) from which
     // to fetch the crate sources.
@@ -1661,7 +1661,7 @@ impl Item_ {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct ForeignItem {
     pub ident: Ident,
     pub attrs: Vec<Attribute>,
@@ -1671,7 +1671,7 @@ pub struct ForeignItem {
     pub vis: Visibility,
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum ForeignItem_ {
     ForeignItemFn(P<FnDecl>, Generics),
     ForeignItemStatic(P<Ty>, /* is_mutbl */ bool),
@@ -1686,7 +1686,7 @@ impl ForeignItem_ {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum ClosureKind {
     FnClosureKind,
     FnMutClosureKind,
@@ -1696,7 +1696,7 @@ pub enum ClosureKind {
 /// The data we save and restore about an inlined item or method.  This is not
 /// part of the AST that we parse from a file, but it becomes part of the tree
 /// that we trans.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub enum InlinedItem {
     IIItem(P<Item>),
     IITraitItem(DefId /* impl id */, TraitItem),
@@ -1707,7 +1707,7 @@ pub enum InlinedItem {
 /// A macro definition, in this crate or imported from another.
 ///
 /// Not parsed directly, but created on macro import or `macro_rules!` expansion.
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct MacroDef {
     pub ident: Ident,
     pub attrs: Vec<Attribute>,
diff --git a/src/libsyntax/ast_map/mod.rs b/src/libsyntax/ast_map/mod.rs
index 96476cabac5..81c03fdfb9b 100644
--- a/src/libsyntax/ast_map/mod.rs
+++ b/src/libsyntax/ast_map/mod.rs
@@ -32,7 +32,7 @@ use std::slice;
 
 pub mod blocks;
 
-#[derive(Clone, Copy, PartialEq, Show)]
+#[derive(Clone, Copy, PartialEq, Debug)]
 pub enum PathElem {
     PathMod(Name),
     PathName(Name)
@@ -104,7 +104,7 @@ pub fn path_to_string<PI: Iterator<Item=PathElem>>(path: PI) -> String {
     }).to_string()
 }
 
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 pub enum Node<'ast> {
     NodeItem(&'ast Item),
     NodeForeignItem(&'ast ForeignItem),
@@ -126,7 +126,7 @@ pub enum Node<'ast> {
 
 /// Represents an entry and its parent Node ID
 /// The odd layout is to bring down the total size.
-#[derive(Copy, Show)]
+#[derive(Copy, Debug)]
 enum MapEntry<'ast> {
     /// Placeholder for holes in the map.
     NotPresent,
@@ -157,7 +157,7 @@ impl<'ast> Clone for MapEntry<'ast> {
     }
 }
 
-#[derive(Show)]
+#[derive(Debug)]
 struct InlinedParent {
     path: Vec<PathElem>,
     ii: InlinedItem
diff --git a/src/libsyntax/ast_util.rs b/src/libsyntax/ast_util.rs
index 5aeea47ac60..a1281a1f689 100644
--- a/src/libsyntax/ast_util.rs
+++ b/src/libsyntax/ast_util.rs
@@ -352,7 +352,7 @@ pub fn empty_generics() -> Generics {
 // ______________________________________________________________________
 // Enumerating the IDs which appear in an AST
 
-#[derive(RustcEncodable, RustcDecodable, Show, Copy)]
+#[derive(RustcEncodable, RustcDecodable, Debug, Copy)]
 pub struct IdRange {
     pub min: NodeId,
     pub max: NodeId,
diff --git a/src/libsyntax/attr.rs b/src/libsyntax/attr.rs
index 061600d9420..4427a7aaf02 100644
--- a/src/libsyntax/attr.rs
+++ b/src/libsyntax/attr.rs
@@ -346,7 +346,7 @@ pub fn cfg_matches(diagnostic: &SpanHandler, cfgs: &[P<MetaItem>], cfg: &ast::Me
 }
 
 /// Represents the #[deprecated] and friends attributes.
-#[derive(RustcEncodable,RustcDecodable,Clone,Show)]
+#[derive(RustcEncodable,RustcDecodable,Clone,Debug)]
 pub struct Stability {
     pub level: StabilityLevel,
     pub feature: InternedString,
@@ -358,7 +358,7 @@ pub struct Stability {
 }
 
 /// The available stability levels.
-#[derive(RustcEncodable,RustcDecodable,PartialEq,PartialOrd,Clone,Show,Copy)]
+#[derive(RustcEncodable,RustcDecodable,PartialEq,PartialOrd,Clone,Debug,Copy)]
 pub enum StabilityLevel {
     Unstable,
     Stable,
@@ -570,7 +570,7 @@ fn int_type_of_word(s: &str) -> Option<IntType> {
     }
 }
 
-#[derive(PartialEq, Show, RustcEncodable, RustcDecodable, Copy)]
+#[derive(PartialEq, Debug, RustcEncodable, RustcDecodable, Copy)]
 pub enum ReprAttr {
     ReprAny,
     ReprInt(Span, IntType),
@@ -589,7 +589,7 @@ impl ReprAttr {
     }
 }
 
-#[derive(Eq, Hash, PartialEq, Show, RustcEncodable, RustcDecodable, Copy)]
+#[derive(Eq, Hash, PartialEq, Debug, RustcEncodable, RustcDecodable, Copy)]
 pub enum IntType {
     SignedInt(ast::IntTy),
     UnsignedInt(ast::UintTy)
diff --git a/src/libsyntax/codemap.rs b/src/libsyntax/codemap.rs
index f93a8b4b317..8adb9b24222 100644
--- a/src/libsyntax/codemap.rs
+++ b/src/libsyntax/codemap.rs
@@ -36,13 +36,13 @@ pub trait Pos {
 
 /// A byte offset. Keep this small (currently 32-bits), as AST contains
 /// a lot of them.
-#[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Show)]
+#[derive(Clone, Copy, PartialEq, Eq, Hash, PartialOrd, Debug)]
 pub struct BytePos(pub u32);
 
 /// A character offset. Because of multibyte utf8 characters, a byte offset
 /// is not equivalent to a character offset. The CodeMap will convert BytePos
 /// values to CharPos values as necessary.
-#[derive(Copy, PartialEq, Hash, PartialOrd, Show)]
+#[derive(Copy, PartialEq, Hash, PartialOrd, Debug)]
 pub struct CharPos(pub usize);
 
 // FIXME: Lots of boilerplate in these impls, but so far my attempts to fix
@@ -94,7 +94,7 @@ impl Sub for CharPos {
 /// are *absolute* positions from the beginning of the codemap, not positions
 /// relative to FileMaps. Methods on the CodeMap can be used to relate spans back
 /// to the original source.
-#[derive(Clone, Copy, Show, Hash)]
+#[derive(Clone, Copy, Debug, Hash)]
 pub struct Span {
     pub lo: BytePos,
     pub hi: BytePos,
@@ -110,7 +110,7 @@ pub const COMMAND_LINE_SP: Span = Span { lo: BytePos(0),
                                          hi: BytePos(0),
                                          expn_id: COMMAND_LINE_EXPN };
 
-#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub struct Spanned<T> {
     pub node: T,
     pub span: Span,
@@ -193,7 +193,7 @@ pub struct FileMapAndLine { pub fm: Rc<FileMap>, pub line: usize }
 pub struct FileMapAndBytePos { pub fm: Rc<FileMap>, pub pos: BytePos }
 
 /// The syntax with which a macro was invoked.
-#[derive(Clone, Copy, Hash, Show)]
+#[derive(Clone, Copy, Hash, Debug)]
 pub enum MacroFormat {
     /// e.g. #[derive(...)] <item>
     MacroAttribute,
@@ -201,7 +201,7 @@ pub enum MacroFormat {
     MacroBang
 }
 
-#[derive(Clone, Hash, Show)]
+#[derive(Clone, Hash, Debug)]
 pub struct NameAndSpan {
     /// The name of the macro that was invoked to create the thing
     /// with this Span.
@@ -215,7 +215,7 @@ pub struct NameAndSpan {
 }
 
 /// Extra information for tracking macro expansion of spans
-#[derive(Hash, Show)]
+#[derive(Hash, Debug)]
 pub struct ExpnInfo {
     /// The location of the actual macro invocation, e.g. `let x =
     /// foo!();`
@@ -236,7 +236,7 @@ pub struct ExpnInfo {
     pub callee: NameAndSpan
 }
 
-#[derive(PartialEq, Eq, Clone, Show, Hash, RustcEncodable, RustcDecodable, Copy)]
+#[derive(PartialEq, Eq, Clone, Debug, Hash, RustcEncodable, RustcDecodable, Copy)]
 pub struct ExpnId(u32);
 
 pub const NO_EXPANSION: ExpnId = ExpnId(-1);
diff --git a/src/libsyntax/diagnostic.rs b/src/libsyntax/diagnostic.rs
index 048bcfc6b72..821ac8e2f89 100644
--- a/src/libsyntax/diagnostic.rs
+++ b/src/libsyntax/diagnostic.rs
@@ -234,7 +234,7 @@ pub fn mk_handler(can_emit_warnings: bool, e: Box<Emitter + Send>) -> Handler {
     }
 }
 
-#[derive(Copy, PartialEq, Clone, Show)]
+#[derive(Copy, PartialEq, Clone, Debug)]
 pub enum Level {
     Bug,
     Fatal,
diff --git a/src/libsyntax/ext/base.rs b/src/libsyntax/ext/base.rs
index dd89153d497..a184cc5c2b2 100644
--- a/src/libsyntax/ext/base.rs
+++ b/src/libsyntax/ext/base.rs
@@ -73,7 +73,7 @@ impl<F> ItemModifier for F
     }
 }
 
-#[derive(Show,Clone)]
+#[derive(Debug,Clone)]
 pub enum Annotatable {
     Item(P<ast::Item>),
     TraitItem(ast::TraitItem),
diff --git a/src/libsyntax/ext/deriving/generic/mod.rs b/src/libsyntax/ext/deriving/generic/mod.rs
index 7f4f5e6ead6..1b84d93738d 100644
--- a/src/libsyntax/ext/deriving/generic/mod.rs
+++ b/src/libsyntax/ext/deriving/generic/mod.rs
@@ -1154,7 +1154,7 @@ impl<'a> MethodDef<'a> {
             // to an uninhabited type (e.g. a zero-variant enum or a
             // type holding such an enum), but do not feature-gate
             // zero-variant enums themselves, then attempting to
-            // derive Show on such a type could here generate code
+            // derive Debug on such a type could here generate code
             // that needs the feature gate enabled.)
 
             return cx.expr_unreachable(sp);
diff --git a/src/libsyntax/ext/mtwt.rs b/src/libsyntax/ext/mtwt.rs
index 7adc443759f..b6563d77b88 100644
--- a/src/libsyntax/ext/mtwt.rs
+++ b/src/libsyntax/ext/mtwt.rs
@@ -38,7 +38,7 @@ pub struct SCTable {
     rename_memo: RefCell<HashMap<(SyntaxContext,Ident,Name),SyntaxContext>>,
 }
 
-#[derive(PartialEq, RustcEncodable, RustcDecodable, Hash, Show, Copy)]
+#[derive(PartialEq, RustcEncodable, RustcDecodable, Hash, Debug, Copy)]
 pub enum SyntaxContext_ {
     EmptyCtxt,
     Mark (Mrk,SyntaxContext),
@@ -309,7 +309,7 @@ mod tests {
 
     // because of the SCTable, I now need a tidy way of
     // creating syntax objects. Sigh.
-    #[derive(Clone, PartialEq, Show)]
+    #[derive(Clone, PartialEq, Debug)]
     enum TestSC {
         M(Mrk),
         R(Ident,Name)
diff --git a/src/libsyntax/parse/lexer/mod.rs b/src/libsyntax/parse/lexer/mod.rs
index 417e440844a..493a97c24cf 100644
--- a/src/libsyntax/parse/lexer/mod.rs
+++ b/src/libsyntax/parse/lexer/mod.rs
@@ -52,7 +52,7 @@ pub trait Reader {
     }
 }
 
-#[derive(Clone, PartialEq, Eq, Show)]
+#[derive(Clone, PartialEq, Eq, Debug)]
 pub struct TokenAndSpan {
     pub tok: token::Token,
     pub sp: Span,
diff --git a/src/libsyntax/parse/token.rs b/src/libsyntax/parse/token.rs
index ac694afac6b..1ef33a2401e 100644
--- a/src/libsyntax/parse/token.rs
+++ b/src/libsyntax/parse/token.rs
@@ -29,7 +29,7 @@ use std::path::BytesContainer;
 use std::rc::Rc;
 
 #[allow(non_camel_case_types)]
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Show, Copy)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Debug, Copy)]
 pub enum BinOpToken {
     Plus,
     Minus,
@@ -44,7 +44,7 @@ pub enum BinOpToken {
 }
 
 /// A delimiter token
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Show, Copy)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Debug, Copy)]
 pub enum DelimToken {
     /// A round parenthesis: `(` or `)`
     Paren,
@@ -54,14 +54,14 @@ pub enum DelimToken {
     Brace,
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Show, Copy)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Debug, Copy)]
 pub enum IdentStyle {
     /// `::` follows the identifier with no whitespace in-between.
     ModName,
     Plain,
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Show, Copy)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Debug, Copy)]
 pub enum SpecialMacroVar {
     /// `$crate` will be filled in with the name of the crate a macro was
     /// imported from, if any.
@@ -76,7 +76,7 @@ impl SpecialMacroVar {
     }
 }
 
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Show, Copy)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Debug, Copy)]
 pub enum Lit {
     Byte(ast::Name),
     Char(ast::Name),
@@ -102,7 +102,7 @@ impl Lit {
 }
 
 #[allow(non_camel_case_types)]
-#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Show)]
+#[derive(Clone, RustcEncodable, RustcDecodable, PartialEq, Eq, Hash, Debug)]
 pub enum Token {
     /* Expression-operator symbols. */
     Eq,
generated by cgit-pink 1.4.1-3-g733a5 (git 2.37.1) at 2026-07-15 03:06:17 +0000