librustc: Implement explicit self for Add and Index; add a hack in the borrow checker to support this. r=nmatsakis

src/libcore/at_vec.rs

@@ -145,12 +145,22 @@ pub pure fn from_elem<T: Copy>(n_elts: uint, t: T) -> @[T] {
 
 #[cfg(notest)]
 pub mod traits {
+    #[cfg(stage0)]
     pub impl<T: Copy> @[T] : Add<&[const T],@[T]> {
         #[inline(always)]
         pure fn add(rhs: & &self/[const T]) -> @[T] {
             append(self, (*rhs))
         }
     }
+
+    #[cfg(stage1)]
+    #[cfg(stage2)]
+    pub impl<T: Copy> @[T] : Add<&[const T],@[T]> {
+        #[inline(always)]
+        pure fn add(&self, rhs: & &self/[const T]) -> @[T] {
+            append(*self, (*rhs))
+        }
+    }
 }
 
 #[cfg(test)]

src/libcore/dvec.rs

@@ -358,10 +358,19 @@ impl<A: Copy> DVec<A> {
     }
 }
 
+#[cfg(stage0)]
 impl<A:Copy> DVec<A>: Index<uint,A> {
     #[inline(always)]
     pure fn index(idx: uint) -> A {
         self.get_elt(idx)
     }
 }
+#[cfg(stage1)]
+#[cfg(stage2)]
+impl<A:Copy> DVec<A>: Index<uint,A> {
+    #[inline(always)]
+    pure fn index(&self, idx: uint) -> A {
+        self.get_elt(idx)
+    }
+}
 

src/libcore/ops.rs

@@ -18,11 +18,19 @@ pub trait Drop {
     fn finalize(&self);  // XXX: Rename to "drop"? --pcwalton
 }
 
+#[cfg(stage0)]
 #[lang="add"]
 pub trait Add<RHS,Result> {
     pure fn add(rhs: &RHS) -> Result;
 }
 
+#[cfg(stage1)]
+#[cfg(stage2)]
+#[lang="add"]
+pub trait Add<RHS,Result> {
+    pure fn add(&self, rhs: &RHS) -> Result;
+}
+
 #[lang="sub"]
 pub trait Sub<RHS,Result> {
     pure fn sub(&self, rhs: &RHS) -> Result;
@@ -73,8 +81,16 @@ pub trait Shr<RHS,Result> {
     pure fn shr(&self, rhs: &RHS) -> Result;
 }
 
+#[cfg(stage0)]
 #[lang="index"]
 pub trait Index<Index,Result> {
     pure fn index(index: Index) -> Result;
 }
 
+#[cfg(stage1)]
+#[cfg(stage2)]
+#[lang="index"]
+pub trait Index<Index,Result> {
+    pure fn index(&self, index: Index) -> Result;
+}
+

src/libcore/str.rs

@@ -2107,12 +2107,21 @@ impl ~str: Trimmable {
 
 #[cfg(notest)]
 pub mod traits {
+    #[cfg(stage0)]
     impl ~str : Add<&str,~str> {
         #[inline(always)]
         pure fn add(rhs: & &self/str) -> ~str {
             append(copy self, (*rhs))
         }
     }
+    #[cfg(stage1)]
+    #[cfg(stage2)]
+    impl ~str : Add<&str,~str> {
+        #[inline(always)]
+        pure fn add(&self, rhs: & &self/str) -> ~str {
+            append(copy *self, (*rhs))
+        }
+    }
 }
 
 #[cfg(test)]

src/libcore/vec.rs

@@ -1438,18 +1438,37 @@ impl<T: Ord> @[T] : Ord {
 }
 
 #[cfg(notest)]
-impl<T: Copy> ~[T] : Add<&[const T],~[T]> {
-    #[inline(always)]
-    pure fn add(rhs: & &self/[const T]) -> ~[T] {
-        append(copy self, (*rhs))
+pub mod traits {
+    #[cfg(stage0)]
+    impl<T: Copy> ~[T] : Add<&[const T],~[T]> {
+        #[inline(always)]
+        pure fn add(rhs: & &self/[const T]) -> ~[T] {
+            append(copy self, (*rhs))
+        }
+    }
+    #[cfg(stage1)]
+    #[cfg(stage2)]
+    impl<T: Copy> ~[T] : Add<&[const T],~[T]> {
+        #[inline(always)]
+        pure fn add(&self, rhs: & &self/[const T]) -> ~[T] {
+            append(copy *self, (*rhs))
+        }
     }
-}
 
-#[cfg(notest)]
-impl<T: Copy> ~[mut T] : Add<&[const T],~[mut T]> {
-    #[inline(always)]
-    pure fn add(rhs: & &self/[const T]) -> ~[mut T] {
-        append_mut(copy self, (*rhs))
+    #[cfg(stage0)]
+    impl<T: Copy> ~[mut T] : Add<&[const T],~[mut T]> {
+        #[inline(always)]
+        pure fn add(rhs: & &self/[const T]) -> ~[mut T] {
+            append_mut(copy self, (*rhs))
+        }
+    }
+    #[cfg(stage1)]
+    #[cfg(stage2)]
+    impl<T: Copy> ~[mut T] : Add<&[const T],~[mut T]> {
+        #[inline(always)]
+        pure fn add(&self, rhs: & &self/[const T]) -> ~[mut T] {
+            append_mut(copy *self, (*rhs))
+        }
     }
 }
 

src/librustc/middle/borrowck/gather_loans.rs

@@ -20,6 +20,8 @@ use mem_categorization::{mem_categorization_ctxt, opt_deref_kind};
 use preserve::{preserve_condition, pc_ok, pc_if_pure};
 use ty::{ty_region};
 
+use core::send_map::linear::LinearMap;
+
 export gather_loans;
 
 /// Context used while gathering loans:
@@ -53,14 +55,16 @@ export gather_loans;
 enum gather_loan_ctxt = @{bccx: borrowck_ctxt,
                           req_maps: req_maps,
                           mut item_ub: ast::node_id,
-                          mut root_ub: ast::node_id};
+                          mut root_ub: ast::node_id,
+                          mut ignore_adjustments: LinearMap<ast::node_id,()>};
 
 fn gather_loans(bccx: borrowck_ctxt, crate: @ast::crate) -> req_maps {
     let glcx = gather_loan_ctxt(@{bccx: bccx,
                                   req_maps: {req_loan_map: HashMap(),
                                              pure_map: HashMap()},
                                   mut item_ub: 0,
-                                  mut root_ub: 0});
+                                  mut root_ub: 0,
+                                  mut ignore_adjustments: LinearMap()});
     let v = visit::mk_vt(@{visit_expr: req_loans_in_expr,
                            visit_fn: req_loans_in_fn,
                            .. *visit::default_visitor()});
@@ -104,8 +108,10 @@ fn req_loans_in_expr(ex: @ast::expr,
            ex.id, pprust::expr_to_str(ex, tcx.sess.intr()));
 
     // If this expression is borrowed, have to ensure it remains valid:
-    for tcx.adjustments.find(ex.id).each |adjustments| {
-        self.guarantee_adjustments(ex, *adjustments);
+    if !self.ignore_adjustments.contains_key(&ex.id) {
+        for tcx.adjustments.find(ex.id).each |adjustments| {
+            self.guarantee_adjustments(ex, *adjustments);
+        }
     }
 
     // Special checks for various kinds of expressions:
@@ -179,7 +185,8 @@ fn req_loans_in_expr(ex: @ast::expr,
 
       ast::expr_index(rcvr, _) |
       ast::expr_binary(_, rcvr, _) |
-      ast::expr_unary(_, rcvr)
+      ast::expr_unary(_, rcvr) |
+      ast::expr_assign_op(_, rcvr, _)
       if self.bccx.method_map.contains_key(ex.id) => {
         // Receivers in method calls are always passed by ref.
         //
@@ -193,6 +200,11 @@ fn req_loans_in_expr(ex: @ast::expr,
         let scope_r = ty::re_scope(ex.id);
         let rcvr_cmt = self.bccx.cat_expr(rcvr);
         self.guarantee_valid(rcvr_cmt, m_imm, scope_r);
+
+        // FIXME (#3387): Total hack: Ignore adjustments for the left-hand
+        // side. Their regions will be inferred to be too large.
+        self.ignore_adjustments.insert(rcvr.id, ());
+
         visit::visit_expr(ex, self, vt);
       }
 

src/libstd/bitv.rs

@@ -565,11 +565,19 @@ pure fn land(w0: uint, w1: uint) -> uint { return w0 & w1; }
 
 pure fn right(_w0: uint, w1: uint) -> uint { return w1; }
 
+#[cfg(stage0)]
 impl Bitv: ops::Index<uint,bool> {
     pure fn index(i: uint) -> bool {
         self.get(i)
     }
 }
+#[cfg(stage1)]
+#[cfg(stage2)]
+impl Bitv: ops::Index<uint,bool> {
+    pure fn index(&self, i: uint) -> bool {
+        self.get(i)
+    }
+}
 
 #[cfg(test)]
 mod tests {

src/libstd/ebml.rs

@@ -57,6 +57,7 @@ pub mod Reader {
 
     // ebml reading
 
+    #[cfg(stage0)]
     impl Doc: ops::Index<uint,Doc> {
         pure fn index(tag: uint) -> Doc {
             unsafe {
@@ -64,6 +65,15 @@ pub mod Reader {
             }
         }
     }
+    #[cfg(stage1)]
+    #[cfg(stage2)]
+    impl Doc: ops::Index<uint,Doc> {
+        pure fn index(&self, tag: uint) -> Doc {
+            unsafe {
+                get_doc(*self, tag)
+            }
+        }
+    }
 
     fn vuint_at(data: &[u8], start: uint) -> {val: uint, next: uint} {
         let a = data[start];

src/libstd/map.rs

@@ -429,6 +429,7 @@ pub mod chained {
         }
     }
 
+    #[cfg(stage0)]
     impl<K:Eq IterBytes Hash Copy, V: Copy> T<K, V>: ops::Index<K, V> {
         pure fn index(k: K) -> V {
             unsafe {
@@ -436,6 +437,15 @@ pub mod chained {
             }
         }
     }
+    #[cfg(stage1)]
+    #[cfg(stage2)]
+    impl<K:Eq IterBytes Hash Copy, V: Copy> T<K, V>: ops::Index<K, V> {
+        pure fn index(&self, k: K) -> V {
+            unsafe {
+                self.get(k)
+            }
+        }
+    }
 
     fn chains<K,V>(nchains: uint) -> ~[mut Option<@Entry<K,V>>] {
         vec::to_mut(vec::from_elem(nchains, None))

src/libstd/smallintmap.rs

@@ -150,6 +150,7 @@ impl<V: Copy> SmallIntMap<V>: map::Map<uint, V> {
     }
 }
 
+#[cfg(stage0)]
 impl<V: Copy> SmallIntMap<V>: ops::Index<uint, V> {
     pure fn index(key: uint) -> V {
         unsafe {
@@ -157,6 +158,15 @@ impl<V: Copy> SmallIntMap<V>: ops::Index<uint, V> {
         }
     }
 }
+#[cfg(stage1)]
+#[cfg(stage2)]
+impl<V: Copy> SmallIntMap<V>: ops::Index<uint, V> {
+    pure fn index(&self, key: uint) -> V {
+        unsafe {
+            get(*self, key)
+        }
+    }
+}
 
 /// Cast the given smallintmap to a map::map
 pub fn as_map<V: Copy>(s: SmallIntMap<V>) -> map::Map<uint, V> {