Fix more misspelled comments and strings.

src/libsyntax/ext/base.rs

@@ -195,7 +195,7 @@ impl DummyResult {
     /// Create a default MacResult that can only be an expression.
     ///
     /// Use this for macros that must expand to an expression, so even
-    /// if an error is encountered internally, the user will recieve
+    /// if an error is encountered internally, the user will receive
     /// an error that they also used it in the wrong place.
     pub fn expr(sp: Span) -> Box<MacResult> {
         box DummyResult { expr_only: true, span: sp } as Box<MacResult>

src/libsyntax/ext/deriving/cmp/ord.rs

@@ -77,7 +77,7 @@ fn cs_op(less: bool, equal: bool, cx: &mut ExtCtxt, span: Span, substr: &Substru
             ```
 
             The optimiser should remove the redundancy. We explicitly
-            get use the binops to avoid auto-deref derefencing too many
+            get use the binops to avoid auto-deref dereferencing too many
             layers of pointers, if the type includes pointers.
             */
             let other_f = match other_fs {

src/libsyntax/ext/deriving/generic/mod.rs

@@ -723,7 +723,7 @@ impl<'a> MethodDef<'a> {
             &Struct(fields));
 
         // make a series of nested matches, to destructure the
-        // structs. This is actually right-to-left, but it shoudn't
+        // structs. This is actually right-to-left, but it shouldn't
         // matter.
         for (&arg_expr, &pat) in self_args.iter().zip(patterns.iter()) {
             body = cx.expr_match(trait_.span, arg_expr,

src/libsyntax/ext/tt/transcribe.rs

@@ -58,7 +58,7 @@ pub fn new_tt_reader<'a>(sp_diag: &'a SpanHandler,
             dotdotdoted: false,
             sep: None,
         }),
-        interpolations: match interp { /* just a convienience */
+        interpolations: match interp { /* just a convenience */
             None => HashMap::new(),
             Some(x) => x,
         },