formatting takes too long

[ohad-starkware]

I have an auto-gen artifact such as this:

let op1_as_rel_imm_cond_col225 = ((pc_update_jnz_col15) + (((((((((((((((((((((((((((((((((((((((((((((((((((((((((const_0))
) + (v))) + (c))) + 
(e))) + (f))) + 
(g))) + (h))) + (a))) + (a))) + (a))) + (a))) + (a))) + (a))) +
 (a))) + (ab))) + (dst_limb_15_col37))) + (a))) + (a))) + (a))) + (aa))))) +
  (a))) + (a))) + (dst_limb_23_ol45))) + (a))) + (a))) + (a))) + (a))));
    });

fmt runs forever!
but if you reduce some characters from some variable names, it runs instantly.

[ytmimi]

Thanks for the report. I'm fairly certain that this is a duplicate of #6357.

If you're using a nightly rustfmt and you don't mind your autogenerated files not being formatted you can add a //@generated comment to the top of the file and set format_generated_files=false. rustfmt will ignore these files and the process won't take forever to run.