syntax: add fully qualified UFCS expressions.

Author: eddyb

src/librustc/lint/builtin.rs

@@ -1731,7 +1731,7 @@ impl LintPass for Stability {
         let mut span = e.span;
 
         let id = match e.node {
-            ast::ExprPath(..) | ast::ExprStruct(..) => {
+            ast::ExprPath(..) | ast::ExprQPath(..) | ast::ExprStruct(..) => {
                 match cx.tcx.def_map.borrow().get(&e.id) {
                     Some(&def) => def.def_id(),
                     None => return

src/librustc/middle/cfg/construct.rs

@@ -495,7 +495,8 @@ impl<'a, 'tcx> CFGBuilder<'a, 'tcx> {
             ast::ExprMac(..) |
             ast::ExprClosure(..) |
             ast::ExprLit(..) |
-            ast::ExprPath(..) => {
+            ast::ExprPath(..) |
+            ast::ExprQPath(..) => {
                 self.straightline(expr, pred, None::<ast::Expr>.iter())
             }
         }

src/librustc/middle/check_const.rs

@@ -111,7 +111,7 @@ fn check_expr(v: &mut CheckCrateVisitor, e: &ast::Expr) {
                            expression");
             }
         }
-        ast::ExprPath(_) => {
+        ast::ExprPath(_) | ast::ExprQPath(_) => {
             match v.tcx.def_map.borrow()[e.id] {
                 DefStatic(..) | DefConst(..) |
                 DefFn(..) | DefStaticMethod(..) | DefMethod(..) |

src/librustc/middle/check_static.rs

@@ -228,7 +228,7 @@ impl<'a, 'tcx, 'v> Visitor<'v> for CheckStaticVisitor<'a, 'tcx> {
                           "{} are not allowed to have custom pointers",
                           self.msg());
             }
-            ast::ExprPath(..) => {
+            ast::ExprPath(_) | ast::ExprQPath(_) => {
                 match ty::resolve_expr(self.tcx, e) {
                     def::DefStatic(..) if self.mode == InConstant => {
                         let msg = "constants cannot refer to other statics, \

src/librustc/middle/check_static_recursion.rs

@@ -93,7 +93,7 @@ impl<'a, 'ast, 'v> Visitor<'v> for CheckItemRecursionVisitor<'a, 'ast> {
 
     fn visit_expr(&mut self, e: &ast::Expr) {
         match e.node {
-            ast::ExprPath(..) => {
+            ast::ExprPath(_) | ast::ExprQPath(_) => {
                 match self.def_map.borrow().get(&e.id) {
                     Some(&DefStatic(def_id, _)) |
                     Some(&DefConst(def_id)) if

src/librustc/middle/const_eval.rs

@@ -244,7 +244,7 @@ impl<'a, 'tcx> ConstEvalVisitor<'a, 'tcx> {
 
             // FIXME: (#3728) we can probably do something CCI-ish
             // surrounding nonlocal constants. But we don't yet.
-            ast::ExprPath(_) => self.lookup_constness(e),
+            ast::ExprPath(_) | ast::ExprQPath(_) => self.lookup_constness(e),
 
             ast::ExprRepeat(..) => general_const,
 
@@ -356,6 +356,13 @@ pub fn const_expr_to_pat(tcx: &ty::ctxt, expr: &Expr) -> P<ast::Pat> {
             }
         }
 
+        ast::ExprQPath(_) => {
+            match lookup_const(tcx, expr) {
+                Some(actual) => return const_expr_to_pat(tcx, actual),
+                _ => unreachable!()
+            }
+        }
+
         _ => ast::PatLit(P(expr.clone()))
     };
     P(ast::Pat { id: expr.id, node: pat, span: expr.span })
@@ -542,7 +549,7 @@ pub fn eval_const_expr_partial(tcx: &ty::ctxt, e: &Expr) -> Result<const_val, St
                 ty::ty_float(ast::TyF64) => (f64, const_float, f64)
             }))
       }
-      ast::ExprPath(_) => {
+      ast::ExprPath(_) | ast::ExprQPath(_) => {
           match lookup_const(tcx, e) {
               Some(actual_e) => eval_const_expr_partial(tcx, &*actual_e),
               None => Err("non-constant path in constant expr".to_string())

src/librustc/middle/effect.rs

@@ -175,7 +175,7 @@ impl<'a, 'tcx, 'v> Visitor<'v> for EffectCheckVisitor<'a, 'tcx> {
             ast::ExprInlineAsm(..) => {
                 self.require_unsafe(expr.span, "use of inline assembly");
             }
-            ast::ExprPath(..) => {
+            ast::ExprPath(_) | ast::ExprQPath(_) => {
                 if let def::DefStatic(_, true) = ty::resolve_expr(self.tcx, expr) {
                     self.require_unsafe(expr.span, "use of mutable static");
                 }

src/librustc/middle/expr_use_visitor.rs

@@ -424,7 +424,7 @@ impl<'d,'t,'tcx,TYPER:mc::Typer<'tcx>> ExprUseVisitor<'d,'t,'tcx,TYPER> {
                 self.walk_expr(&**subexpr)
             }
 
-            ast::ExprPath(..) => { }
+            ast::ExprPath(_) | ast::ExprQPath(_) => { }
 
             ast::ExprUnary(ast::UnDeref, ref base) => {      // *base
                 if !self.walk_overloaded_operator(expr, &**base, Vec::new(), PassArgs::ByRef) {

src/librustc/middle/liveness.rs

@@ -447,7 +447,7 @@ fn visit_arm(ir: &mut IrMaps, arm: &ast::Arm) {
 fn visit_expr(ir: &mut IrMaps, expr: &Expr) {
     match expr.node {
       // live nodes required for uses or definitions of variables:
-      ast::ExprPath(_) => {
+      ast::ExprPath(_) | ast::ExprQPath(_) => {
         let def = ir.tcx.def_map.borrow()[expr.id].clone();
         debug!("expr {}: path that leads to {:?}", expr.id, def);
         if let DefLocal(..) = def {
@@ -960,7 +960,7 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
         match expr.node {
           // Interesting cases with control flow or which gen/kill
 
-          ast::ExprPath(_) => {
+          ast::ExprPath(_) | ast::ExprQPath(_) => {
               self.access_path(expr, succ, ACC_READ | ACC_USE)
           }
 
@@ -1289,7 +1289,7 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
         // just ignore such cases and treat them as reads.
 
         match expr.node {
-            ast::ExprPath(_) => succ,
+            ast::ExprPath(_) | ast::ExprQPath(_) => succ,
             ast::ExprField(ref e, _) => self.propagate_through_expr(&**e, succ),
             ast::ExprTupField(ref e, _) => self.propagate_through_expr(&**e, succ),
             _ => self.propagate_through_expr(expr, succ)
@@ -1300,7 +1300,9 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
     fn write_lvalue(&mut self, expr: &Expr, succ: LiveNode, acc: uint)
                     -> LiveNode {
         match expr.node {
-          ast::ExprPath(_) => self.access_path(expr, succ, acc),
+          ast::ExprPath(_) | ast::ExprQPath(_) => {
+              self.access_path(expr, succ, acc)
+          }
 
           // We do not track other lvalues, so just propagate through
           // to their subcomponents.  Also, it may happen that
@@ -1492,7 +1494,7 @@ fn check_expr(this: &mut Liveness, expr: &Expr) {
       ast::ExprBlock(..) | ast::ExprMac(..) | ast::ExprAddrOf(..) |
       ast::ExprStruct(..) | ast::ExprRepeat(..) | ast::ExprParen(..) |
       ast::ExprClosure(..) | ast::ExprPath(..) | ast::ExprBox(..) |
-      ast::ExprRange(..) => {
+      ast::ExprRange(..) | ast::ExprQPath(..) => {
         visit::walk_expr(this, expr);
       }
       ast::ExprIfLet(..) => {
@@ -1583,7 +1585,7 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
 
     fn check_lvalue(&mut self, expr: &Expr) {
         match expr.node {
-            ast::ExprPath(_) => {
+            ast::ExprPath(_) | ast::ExprQPath(_) => {
                 if let DefLocal(nid) = self.ir.tcx.def_map.borrow()[expr.id].clone() {
                     // Assignment to an immutable variable or argument: only legal
                     // if there is no later assignment. If this local is actually

src/librustc/middle/mem_categorization.rs

@@ -520,7 +520,7 @@ impl<'t,'tcx,TYPER:Typer<'tcx>> MemCategorizationContext<'t,TYPER> {
             }
           }
 
-          ast::ExprPath(_) => {
+          ast::ExprPath(_) | ast::ExprQPath(_) => {
             let def = (*self.tcx().def_map.borrow())[expr.id];
             self.cat_def(expr.id, expr.span, expr_ty, def)
           }