Add HeapSizeOf impl for ParseError

Author: KiChjang

src/parser.rs

@@ -13,6 +13,7 @@ use std::str;
 
 use Url;
 use encoding::EncodingOverride;
+#![cfg(feature = "heapsize")] use heapsize::HeapSizeOf;
 use host::{Host, HostInternal};
 use percent_encoding::{
     utf8_percent_encode, percent_encode,
@@ -57,6 +58,13 @@ simple_enum_error! {
     Overflow => "URLs more than 4 GB are not supported",
 }
 
+#![cfg(feature = "heapsize")]
+impl HeapSizeOf for ParseError {
+    fn heap_size_of_children(&self) -> usize {
+        0
+    }
+}
+
 impl fmt::Display for ParseError {
     fn fmt(&self, fmt: &mut Formatter) -> fmt::Result {
         self.description().fmt(fmt)