Merge branch 'fix_find'

internal/shop.cm

@@ -949,10 +949,11 @@ function try_dylib_symbol(sym, pkg, file_stem) {
 
   var c_file = file_stem + '.c'
   var cpp_file = file_stem + '.cpp'
-  var entry = null
-  arrfor(dylibs, function(r) {
-    if (r.file == c_file || r.file == cpp_file) entry = r
+  var idx = find(dylibs, function(r) {
+    return r.file == c_file || r.file == cpp_file
   })
+  if (idx == null) return null
+  var entry = dylibs[idx]
   if (!entry || !entry.dylib) return null
 
   var handle = open_dls[entry.dylib]