rust-lang · petrochenkov · Dec 18, 2015
diff --git a/src/librustc/middle/infer/error_reporting.rs b/src/librustc/middle/infer/error_reporting.rs
@@ -93,6 +93,7 @@ use syntax::ast;
 use syntax::codemap::{self, Pos, Span};
 use syntax::parse::token;
 use syntax::ptr::P;
+use syntax::util::MoveMap;
 
 impl<'tcx> ty::ctxt<'tcx> {
     pub fn note_and_explain_region(&self,
@@ -1153,19 +1154,19 @@ impl<'a, 'tcx> Rebuilder<'a, 'tcx> {
     }
 
     fn rebuild_ty_params(&self,
-                         ty_params: P<[hir::TyParam]>,
+                         ty_params: hir::HirVec<hir::TyParam>,
                          lifetime: hir::Lifetime,
                          region_names: &HashSet<ast::Name>)
-                         -> P<[hir::TyParam]> {
-        ty_params.map(|ty_param| {
-            let bounds = self.rebuild_ty_param_bounds(ty_param.bounds.clone(),
+                         -> hir::HirVec<hir::TyParam> {
+        ty_params.move_map(|ty_param| {
+            let bounds = self.rebuild_ty_param_bounds(ty_param.bounds,
                                                       lifetime,
                                                       region_names);
             hir::TyParam {
                 name: ty_param.name,
                 id: ty_param.id,
                 bounds: bounds,
-                default: ty_param.default.clone(),
+                default: ty_param.default,
                 span: ty_param.span,
             }
         })
@@ -1176,15 +1177,15 @@ impl<'a, 'tcx> Rebuilder<'a, 'tcx> {
                                lifetime: hir::Lifetime,
                                region_names: &HashSet<ast::Name>)
                                -> hir::TyParamBounds {
-        ty_param_bounds.map(|tpb| {
+        ty_param_bounds.move_map(|tpb| {
             match tpb {
-                &hir::RegionTyParamBound(lt) => {
+                hir::RegionTyParamBound(lt) => {
                     // FIXME -- it's unclear whether I'm supposed to
                     // substitute lifetime here. I suspect we need to
                     // be passing down a map.
                     hir::RegionTyParamBound(lt)
                 }
-                &hir::TraitTyParamBound(ref poly_tr, modifier) => {
+                hir::TraitTyParamBound(ref poly_tr, modifier) => {
                     let tr = &poly_tr.trait_ref;
                     let last_seg = tr.path.segments.last().unwrap();
                     let mut insert = Vec::new();
@@ -1248,7 +1249,7 @@ impl<'a, 'tcx> Rebuilder<'a, 'tcx> {
                         add: &Vec<hir::Lifetime>,
                         keep: &HashSet<ast::Name>,
                         remove: &HashSet<ast::Name>,
-                        ty_params: P<[hir::TyParam]>,
+                        ty_params: hir::HirVec<hir::TyParam>,
                         where_clause: hir::WhereClause)
                         -> hir::Generics {
         let mut lifetimes = Vec::new();
@@ -1498,10 +1499,10 @@ impl<'a, 'tcx> Rebuilder<'a, 'tcx> {
                         }
                     }
                 }
-                let new_types = data.types.map(|t| {
+                let new_types = data.types.iter().map(|t| {
                     self.rebuild_arg_ty_or_output(&**t, lifetime, anon_nums, region_names)
-                });
-                let new_bindings = data.bindings.map(|b| {
+                }).collect();
+                let new_bindings = data.bindings.iter().map(|b| {
                     hir::TypeBinding {
                         id: b.id,
                         name: b.name,
@@ -1511,7 +1512,7 @@ impl<'a, 'tcx> Rebuilder<'a, 'tcx> {
                                                           region_names),
                         span: b.span
                     }
-                });
+                }).collect();
                 hir::AngleBracketedParameters(hir::AngleBracketedParameterData {
                     lifetimes: new_lts.into(),
                     types: new_types,

diff --git a/src/librustc_front/fold.rs b/src/librustc_front/fold.rs
@@ -19,7 +19,7 @@ use hir;
 use syntax::codemap::{respan, Span, Spanned};
 use syntax::ptr::P;
 use syntax::parse::token;
-use syntax::util::move_map::MoveMap;
+use syntax::util::{MoveMap, MoveFlatMap};
 
 pub trait Folder : Sized {
     // Any additions to this trait should happen in form
@@ -210,7 +210,7 @@ pub trait Folder : Sized {
         noop_fold_ty_param(tp, self)
     }
 
-    fn fold_ty_params(&mut self, tps: P<[TyParam]>) -> P<[TyParam]> {
+    fn fold_ty_params(&mut self, tps: HirVec<TyParam>) -> HirVec<TyParam> {
         noop_fold_ty_params(tps, self)
     }
 
@@ -575,9 +575,9 @@ pub fn noop_fold_ty_param<T: Folder>(tp: TyParam, fld: &mut T) -> TyParam {
     }
 }
 
-pub fn noop_fold_ty_params<T: Folder>(tps: P<[TyParam]>,
+pub fn noop_fold_ty_params<T: Folder>(tps: HirVec<TyParam>,
                                       fld: &mut T)
-                                      -> P<[TyParam]> {
+                                      -> HirVec<TyParam> {
     tps.move_map(|tp| fld.fold_ty_param(tp))
 }
 

diff --git a/src/librustc_front/hir.rs b/src/librustc_front/hir.rs
@@ -208,8 +208,8 @@ impl PathParameters {
     pub fn none() -> PathParameters {
         AngleBracketedParameters(AngleBracketedParameterData {
             lifetimes: HirVec::new(),
-            types: P::empty(),
-            bindings: P::empty(),
+            types: HirVec::new(),
+            bindings: HirVec::new(),
         })
     }
 
@@ -282,10 +282,10 @@ pub struct AngleBracketedParameterData {
     /// The lifetime parameters for this path segment.
     pub lifetimes: HirVec<Lifetime>,
     /// The type parameters for this path segment, if present.
-    pub types: P<[P<Ty>]>,
+    pub types: HirVec<P<Ty>>,
     /// Bindings (equality constraints) on associated types, if present.
     /// E.g., `Foo<A=Bar>`.
-    pub bindings: P<[TypeBinding]>,
+    pub bindings: HirVec<TypeBinding>,
 }
 
 impl AngleBracketedParameterData {
@@ -325,7 +325,7 @@ pub enum TraitBoundModifier {
     Maybe,
 }
 
-pub type TyParamBounds = P<[TyParamBound]>;
+pub type TyParamBounds = HirVec<TyParamBound>;
 
 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct TyParam {
@@ -341,7 +341,7 @@ pub struct TyParam {
 #[derive(Clone, PartialEq, Eq, RustcEncodable, RustcDecodable, Hash, Debug)]
 pub struct Generics {
     pub lifetimes: HirVec<LifetimeDef>,
-    pub ty_params: P<[TyParam]>,
+    pub ty_params: HirVec<TyParam>,
     pub where_clause: WhereClause,
 }
 

diff --git a/src/librustc_front/lowering.rs b/src/librustc_front/lowering.rs
@@ -433,8 +433,8 @@ pub fn lower_ty_param(lctx: &LoweringContext, tp: &TyParam) -> hir::TyParam {
 }
 
 pub fn lower_ty_params(lctx: &LoweringContext,
-                       tps: &P<[TyParam]>)
-                       -> P<[hir::TyParam]> {
+                       tps: &[TyParam])
+                       -> hir::HirVec<hir::TyParam> {
     tps.iter().map(|tp| lower_ty_param(lctx, tp)).collect()
 }
 
@@ -1771,19 +1771,19 @@ fn path_ident(span: Span, id: hir::Ident) -> hir::Path {
 }
 
 fn path(span: Span, strs: Vec<hir::Ident>) -> hir::Path {
-    path_all(span, false, strs, hir::HirVec::new(), Vec::new(), Vec::new())
+    path_all(span, false, strs, hir::HirVec::new(), hir::HirVec::new(), hir::HirVec::new())
 }
 
 fn path_global(span: Span, strs: Vec<hir::Ident>) -> hir::Path {
-    path_all(span, true, strs, hir::HirVec::new(), Vec::new(), Vec::new())
+    path_all(span, true, strs, hir::HirVec::new(), hir::HirVec::new(), hir::HirVec::new())
 }
 
 fn path_all(sp: Span,
             global: bool,
             mut idents: Vec<hir::Ident>,
             lifetimes: hir::HirVec<hir::Lifetime>,
-            types: Vec<P<hir::Ty>>,
-            bindings: Vec<hir::TypeBinding>)
+            types: hir::HirVec<P<hir::Ty>>,
+            bindings: hir::HirVec<hir::TypeBinding>)
             -> hir::Path {
     let last_identifier = idents.pop().unwrap();
     let mut segments: Vec<hir::PathSegment> = idents.into_iter()
@@ -1798,8 +1798,8 @@ fn path_all(sp: Span,
         identifier: last_identifier,
         parameters: hir::AngleBracketedParameters(hir::AngleBracketedParameterData {
             lifetimes: lifetimes,
-            types: P::from_vec(types),
-            bindings: P::from_vec(bindings),
+            types: types.into(),
+            bindings: bindings.into(),
         }),
     });
     hir::Path {

diff --git a/src/librustc_front/print/pprust.rs b/src/librustc_front/print/pprust.rs
@@ -518,7 +518,7 @@ impl<'a> State<'a> {
             hir::TyBareFn(ref f) => {
                 let generics = hir::Generics {
                     lifetimes: f.lifetimes.clone(),
-                    ty_params: P::empty(),
+                    ty_params: hir::HirVec::new(),
                     where_clause: hir::WhereClause {
                         id: ast::DUMMY_NODE_ID,
                         predicates: hir::HirVec::new(),
@@ -2257,7 +2257,7 @@ impl<'a> State<'a> {
         }
         let generics = hir::Generics {
             lifetimes: hir::HirVec::new(),
-            ty_params: P::empty(),
+            ty_params: hir::HirVec::new(),
             where_clause: hir::WhereClause {
                 id: ast::DUMMY_NODE_ID,
                 predicates: hir::HirVec::new(),

diff --git a/src/librustc_front/util.rs b/src/librustc_front/util.rs
@@ -335,7 +335,7 @@ pub fn is_path(e: P<Expr>) -> bool {
 pub fn empty_generics() -> Generics {
     Generics {
         lifetimes: HirVec::new(),
-        ty_params: P::empty(),
+        ty_params: HirVec::new(),
         where_clause: WhereClause {
             id: DUMMY_NODE_ID,
             predicates: HirVec::new(),
@@ -353,8 +353,8 @@ pub fn ident_to_path(s: Span, ident: Ident) -> Path {
             identifier: ident,
             parameters: hir::AngleBracketedParameters(hir::AngleBracketedParameterData {
                 lifetimes: HirVec::new(),
-                types: P::empty(),
-                bindings: P::empty(),
+                types: HirVec::new(),
+                bindings: HirVec::new(),
             }),
         }],
     }

diff --git a/src/librustc_mir/hair/cx/to_ref.rs b/src/librustc_mir/hair/cx/to_ref.rs
@@ -61,3 +61,13 @@ impl<'a,'tcx:'a,T,U> ToRef for &'tcx Vec<T>
         self.iter().map(|expr| expr.to_ref()).collect()
     }
 }
+
+impl<'a,'tcx:'a,T,U> ToRef for &'tcx P<[T]>
+    where &'tcx T: ToRef<Output=U>
+{
+    type Output = Vec<U>;
+
+    fn to_ref(self) -> Vec<U> {
+        self.iter().map(|expr| expr.to_ref()).collect()
+    }
+}
diff --git a/src/librustc_typeck/check/mod.rs b/src/librustc_typeck/check/mod.rs
@@ -4906,7 +4906,7 @@ pub fn may_break(cx: &ty::ctxt, id: ast::NodeId, b: &hir::Block) -> bool {
 }
 
 pub fn check_bounds_are_used<'a, 'tcx>(ccx: &CrateCtxt<'a, 'tcx>,
-                                       tps: &P<[hir::TyParam]>,
+                                       tps: &[hir::TyParam],
                                        ty: Ty<'tcx>) {
     debug!("check_bounds_are_used(n_tps={}, ty={:?})",
            tps.len(),  ty);

diff --git a/src/libsyntax/ast.rs b/src/libsyntax/ast.rs
@@ -260,8 +260,8 @@ impl PathParameters {
     pub fn none() -> PathParameters {
         AngleBracketedParameters(AngleBracketedParameterData {
             lifetimes: Vec::new(),
-            types: P::empty(),
-            bindings: P::empty(),
+            types: P::new(),
+            bindings: P::new(),
         })
     }
 
@@ -429,7 +429,7 @@ impl Default for Generics {
     fn default() ->  Generics {
         Generics {
             lifetimes: Vec::new(),
-            ty_params: P::empty(),
+            ty_params: P::new(),
             where_clause: WhereClause {
                 id: DUMMY_NODE_ID,
                 predicates: Vec::new(),

diff --git a/src/libsyntax/ast_util.rs b/src/libsyntax/ast_util.rs
@@ -42,8 +42,8 @@ pub fn ident_to_path(s: Span, identifier: Ident) -> Path {
                 identifier: identifier,
                 parameters: ast::AngleBracketedParameters(ast::AngleBracketedParameterData {
                     lifetimes: Vec::new(),
-                    types: P::empty(),
-                    bindings: P::empty(),
+                    types: P::new(),
+                    bindings: P::new(),
                 })
             }
         ),

diff --git a/src/libsyntax/ext/build.rs b/src/libsyntax/ext/build.rs
@@ -69,8 +69,8 @@ pub trait AstBuilder {
     fn ty_option(&self, ty: P<ast::Ty>) -> P<ast::Ty>;
     fn ty_infer(&self, sp: Span) -> P<ast::Ty>;
 
-    fn ty_vars(&self, ty_params: &P<[ast::TyParam]>) -> Vec<P<ast::Ty>> ;
-    fn ty_vars_global(&self, ty_params: &P<[ast::TyParam]>) -> Vec<P<ast::Ty>> ;
+    fn ty_vars(&self, ty_params: &[ast::TyParam]) -> Vec<P<ast::Ty>> ;
+    fn ty_vars_global(&self, ty_params: &[ast::TyParam]) -> Vec<P<ast::Ty>> ;
 
     fn typaram(&self,
                span: Span,
@@ -330,8 +330,8 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
             identifier: last_identifier,
             parameters: ast::AngleBracketedParameters(ast::AngleBracketedParameterData {
                 lifetimes: lifetimes,
-                types: P::from_vec(types),
-                bindings: P::from_vec(bindings),
+                types: P::from(types),
+                bindings: P::from(bindings),
             })
         });
         ast::Path {
@@ -368,8 +368,8 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
             identifier: ident,
             parameters: ast::AngleBracketedParameters(ast::AngleBracketedParameterData {
                 lifetimes: lifetimes,
-                types: P::from_vec(types),
-                bindings: P::from_vec(bindings),
+                types: P::from(types),
+                bindings: P::from(bindings),
             })
         });
 
@@ -461,11 +461,11 @@ impl<'a> AstBuilder for ExtCtxt<'a> {
     // these are strange, and probably shouldn't be used outside of
     // pipes. Specifically, the global version possible generates
     // incorrect code.
-    fn ty_vars(&self, ty_params: &P<[ast::TyParam]>) -> Vec<P<ast::Ty>> {
+    fn ty_vars(&self, ty_params: &[ast::TyParam]) -> Vec<P<ast::Ty>> {
         ty_params.iter().map(|p| self.ty_ident(DUMMY_SP, p.ident)).collect()
     }
 
-    fn ty_vars_global(&self, ty_params: &P<[ast::TyParam]>) -> Vec<P<ast::Ty>> {
+    fn ty_vars_global(&self, ty_params: &[ast::TyParam]) -> Vec<P<ast::Ty>> {
         ty_params
             .iter()
             .map(|p| self.ty_path(self.path_global(DUMMY_SP, vec!(p.ident))))

diff --git a/src/libsyntax/ext/expand.rs b/src/libsyntax/ext/expand.rs
@@ -24,14 +24,14 @@ use ext::base::*;
 use feature_gate::{self, Features};
 use fold;
 use fold::*;
-use util::move_map::MoveMap;
 use parse;
 use parse::token::{fresh_mark, fresh_name, intern};
 use ptr::P;
 use util::small_vector::SmallVector;
 use visit;
 use visit::Visitor;
 use std_inject;
+use util::MoveMap;
 
 use std::collections::HashSet;
 

diff --git a/src/libsyntax/fold.rs b/src/libsyntax/fold.rs
@@ -25,8 +25,8 @@ use ast_util;
 use codemap::{respan, Span, Spanned};
 use parse::token;
 use ptr::P;
+use util::{MoveMap, MoveFlatMap};
 use util::small_vector::SmallVector;
-use util::move_map::MoveMap;
 
 use std::rc::Rc;
 

diff --git a/src/libsyntax/lib.rs b/src/libsyntax/lib.rs
@@ -61,14 +61,16 @@ macro_rules! panictry {
 }
 
 pub mod util {
+    pub use self::move_map::{MoveMap, MoveFlatMap};
+
     pub mod interner;
     pub mod lev_distance;
+    pub mod move_map;
     pub mod node_count;
     pub mod parser;
     #[cfg(test)]
     pub mod parser_testing;
     pub mod small_vector;
-    pub mod move_map;
 }
 
 pub mod diagnostics {

diff --git a/src/libsyntax/parse/mod.rs b/src/libsyntax/parse/mod.rs
@@ -946,7 +946,7 @@ mod tests {
                                     abi::Rust,
                                     ast::Generics{ // no idea on either of these:
                                         lifetimes: Vec::new(),
-                                        ty_params: P::empty(),
+                                        ty_params: P::new(),
                                         where_clause: ast::WhereClause {
                                             id: ast::DUMMY_NODE_ID,
                                             predicates: Vec::new(),