Merge pull request #4609 from sonwow/keyword-super

Make `super` a keyword

doc/rust.md

@@ -222,7 +222,7 @@ let log loop
 match mod move mut
 priv pub pure
 ref return
-self static struct
+self static struct super
 true trait type
 unsafe use
 while

src/librustc/middle/ty.rs

@@ -1659,13 +1659,13 @@ fn subst(cx: ctxt,
     }
 }
 
-// Performs substitutions on a set of substitutions (result = super(sub)) to
+// Performs substitutions on a set of substitutions (result = sup(sub)) to
 // yield a new set of substitutions. This is used in trait inheritance.
-fn subst_substs(cx: ctxt, super: &substs, sub: &substs) -> substs {
+fn subst_substs(cx: ctxt, sup: &substs, sub: &substs) -> substs {
     {
-        self_r: super.self_r,
+        self_r: sup.self_r,
-        self_ty: super.self_ty.map(|typ| subst(cx, sub, *typ)),
+        self_ty: sup.self_ty.map(|typ| subst(cx, sub, *typ)),
-        tps: super.tps.map(|typ| subst(cx, sub, *typ))
+        tps: sup.tps.map(|typ| subst(cx, sub, *typ))
     }
 }
 

src/libsyntax/parse/token.rs

@@ -493,7 +493,7 @@ fn strict_keyword_table() -> HashMap<~str, ()> {
         ~"once",
         ~"priv", ~"pub", ~"pure",
         ~"ref", ~"return",
-        ~"struct",
+        ~"struct", ~"super",
         ~"true", ~"trait", ~"type",
         ~"unsafe", ~"use",
         ~"while"

src/test/compile-fail/keyword-super.rs

@@ -0,0 +1,3 @@
+fn main() {
+    let super: int; //~ ERROR found `super` in ident position
+}