Update elixir, perl and rust

indent/elixir.vim

@@ -59,6 +59,10 @@ function! GetElixirIndent()
 
     let ind += opened_symbol * &sw
 
+    if current_line =~ '^\s*\(\]\|}\)'
+      let ind -= &sw
+    endif
+
     if last_line =~ s:indent_keywords
       let ind += &sw
     endif

syntax/perl.vim

@@ -410,7 +410,7 @@ if exists("perl_fold")
   endif
   if !exists("perl_nofold_subs")
     if exists("perl_fold_anonymous_subs") && perl_fold_anonymous_subs
-      syn region perlSubFold     start="\<sub\>[^\n;]*{" end="}" transparent fold keepend extend
+      syn region perlSubFold     start="\<sub\>[^;]*{" end="}" transparent fold keepend extend
       syn region perlSubFold     start="\<\%(BEGIN\|END\|CHECK\|INIT\)\>\s*{" end="}" transparent fold keepend
     else
       syn region perlSubFold     start="^\z(\s*\)\<sub\>.*[^};]$" end="^\z1}\s*\%(#.*\)\=$" transparent fold keepend

syntax/rust.vim

@@ -96,7 +96,7 @@ syn keyword rustTrait MutableVector MutableTotalOrdVector
 syn keyword rustTrait Vector VectorVector CloneableVector ImmutableVector
 
 "syn keyword rustFunction stream
-syn keyword rustTrait Port Chan
+syn keyword rustTrait Sender Receiver
 "syn keyword rustFunction spawn
 
 syn keyword   rustSelf        self