Fix formatting and compilation error

packages/buffered/_test.pony

@@ -118,7 +118,7 @@ class iso _TestWriter is UnitTest
         [as U8: '\n'; 't'; 'h'; 'e']
         [as U8: 'r'; 'e'; '\r'; '\n']] end)
 
-    let wb' : Array[(String val | Array[U8 val] val)] ref = wb.done()
+    let wb': Array[(String val | Array[U8 val] val)] ref = wb.done()
     for bs in wb'.values() do
       try
         b.append(bs as Array[U8] val)

packages/files/directory.pony

@@ -426,7 +426,7 @@ class Directory
         if fi.directory and not fi.symlink then
           let directory = open(target)
 
-          let dir_entries : Array[String] ref = directory.entries()
+          let dir_entries: Array[String] ref = directory.entries()
           for entry in dir_entries.values() do
             if not directory.remove(entry) then
               return false

packages/files/file_path.pony

@@ -196,7 +196,7 @@ class val FilePath
       if info.directory and not info.symlink then
         let directory = Directory(this)
 
-        let entries : Array[String] ref = directory.entries()
+        let entries: Array[String] ref = directory.entries()
         for entry in entries.values() do
           if not join(entry).remove() then
             return false

packages/term/ansi_term.pony

@@ -80,7 +80,7 @@ actor ANSITerm
       return
     end
 
-    let data' : Array[U8] ref = consume data
+    let data': Array[U8] ref = consume data
     for c in data'.values() do
       match _escape
       | _EscapeNone =>

src/libponyc/type/reify.c

@@ -8,7 +8,7 @@
 
 static ast_t* find_typearg(pass_opt_t* opt, ast_t* ast, ast_t* typeparams, ast_t* typeargs)
 {
-  ast_t* ref_def;
+  ast_t* ref_def = NULL;
   switch(ast_id(ast))
   {
     case TK_REFERENCE: