util: ppaux: remove dead code

src/librustc/util/ppaux.rs

@@ -58,14 +58,6 @@ pub fn note_and_explain_region(cx: &ctxt,
     }
 }
 
-/// Returns a string like "the block at 27:31" that attempts to explain a
-/// lifetime in a way it might plausibly be understood.
-pub fn explain_region(cx: &ctxt, region: ty::Region) -> ~str {
-  let (res, _) = explain_region_and_span(cx, region);
-  return res;
-}
-
-
 pub fn explain_region_and_span(cx: &ctxt, region: ty::Region)
                             -> (~str, Option<Span>) {
     return match region {
@@ -165,42 +157,6 @@ pub fn bound_region_to_str(cx: &ctxt,
     }
 }
 
-pub fn ReScope_id_to_str(cx: &ctxt, node_id: ast::NodeId) -> ~str {
-    match cx.map.find(node_id) {
-      Some(ast_map::NodeBlock(ref blk)) => {
-        format!("<block at {}>",
-             cx.sess.codemap().span_to_str(blk.span))
-      }
-      Some(ast_map::NodeExpr(expr)) => {
-        match expr.node {
-          ast::ExprCall(..) => {
-            format!("<call at {}>",
-                 cx.sess.codemap().span_to_str(expr.span))
-          }
-          ast::ExprMatch(..) => {
-            format!("<match at {}>",
-                 cx.sess.codemap().span_to_str(expr.span))
-          }
-          ast::ExprAssignOp(..) |
-          ast::ExprUnary(..) |
-          ast::ExprBinary(..) |
-          ast::ExprIndex(..) => {
-            format!("<method at {}>",
-                 cx.sess.codemap().span_to_str(expr.span))
-          }
-          _ => {
-            format!("<expression at {}>",
-                 cx.sess.codemap().span_to_str(expr.span))
-          }
-        }
-      }
-      None => {
-        format!("<unknown-{}>", node_id)
-      }
-      _ => cx.sess.bug(format!("ReScope refers to {}", cx.map.node_to_str(node_id)))
-    }
-}
-
 // In general, if you are giving a region error message,
 // you should use `explain_region()` or, better yet,
 // `note_and_explain_region()`
@@ -280,10 +236,6 @@ pub fn vec_map_to_str<T>(ts: &[T], f: |t: &T| -> ~str) -> ~str {
     format!("[{}]", tstrs.connect(", "))
 }
 
-pub fn tys_to_str(cx: &ctxt, ts: &[t]) -> ~str {
-    vec_map_to_str(ts, |t| ty_to_str(cx, *t))
-}
-
 pub fn fn_sig_to_str(cx: &ctxt, typ: &ty::FnSig) -> ~str {
     format!("fn{}{} -> {}",
             typ.binder_id,