rustc: Cap ridiculous type name sizes

Author: pcwalton

src/comp/middle/ty.rs

@@ -630,7 +630,9 @@ fn ty_to_str(ctxt cx, &t typ) -> str {
 fn ty_to_abbrev_str(ctxt cx, t typ) -> str {
     auto f = def_to_str;
     auto ecx = @rec(ds=f, tcx=cx);
-    ret metadata.Encode.ty_str(ecx, typ);
+    auto s = metadata.Encode.ty_str(ecx, typ);
+    if (_str.byte_len(s) >= 64u) { s = _str.substr(s, 0u, 64u); }
+    ret s;
 }
 
 // Type folds