Switched over substr and trim functions in str to be non-allocating, temporary renamed them to better track use-sites

src/librustdoc/text_pass.rs

@@ -311,7 +311,7 @@ mod test {
             let doc = (attr_pass::mk_pass().f)(srv.clone(), doc);
             let doc = (desc_to_brief_pass::mk_pass().f)(srv.clone(), doc);
             let doc = (sectionalize_pass::mk_pass().f)(srv.clone(), doc);
-            (mk_pass(~"", |s| str::trim(s) ).f)(srv.clone(), doc)
+            (mk_pass(~"", |s| str::trim_DBGBRWD(s).to_owned() ).f)(srv.clone(), doc)
         }
     }
 }

src/librustdoc/trim_pass.rs

@@ -21,7 +21,7 @@ use text_pass;
 use core::str;
 
 pub fn mk_pass() -> Pass {
-    text_pass::mk_pass(~"trim", |s| str::trim(s) )
+    text_pass::mk_pass(~"trim", |s| s.trim_DBGBRWD().to_owned() )
 }
 
 #[test]

src/librustdoc/unindent_pass.rs

@@ -78,7 +78,7 @@ fn unindent(s: &str) -> ~str {
     };
 
     if !lines.is_empty() {
-        let unindented = ~[lines.head().trim()]
+        let unindented = ~[lines.head().trim_DBGBRWD().to_owned()]
             + do lines.tail().map |line| {
             if str::is_whitespace(*line) {
                 copy *line