Subtraction error without a specific line

Getting errors like

ligo compile-contract contract.mligo main
ligo: error
      Invalid subtraction.
      The following forms of subtractions are possible:
        * timestamp - int = timestamp
        * timestamp - timestamp = int
        * int/nat - int/nat = int 
        * mutez/tez - mutez/tez = mutez.
      
      
      If you're not sure how to fix this error, you can do one of the following:
      
      * Visit our documentation: https://ligolang.org/docs/intro/introduction
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      * Open a gitlab issue: https://gitlab.com/ligolang/ligo/issues/new
      * Check the changelog by running 'ligo changelog'

I know what's going on, I have x of type {foo : int} and y of type int and I'm writing x - y instead of x.foo - y. The problem is I don't know where that happens in my code, and the ligo compiler doesn't tell me.

ligo --version
Rolling release
Commit SHA: 7a0b0bc77c030039f28fd3ee20361c32632f683a
Commit Date: 2020-08-20 14:57:59 +0000