It generate mnemonic everytime lookup

[stardiviner]

My environment version:

pdftotext version: 0.46.0
Emacs version (compiled from source code): 25.1.50.16

The index file in ~/.cache/x86-lookup/ is generated.

I run edebug on function x86-lookup, found problem is on function x86-lookup--load-index. And the let binding variables index-file and cache-path are correct, but x86-lookup--load-index returns nil. Then I checked out the index cache file with command cat. Found it is nil.
I will take a try with Emacs 24.

[stardiviner]

Problem is solved, Emacs 24.5 generate index cache successfully.