I can't find it with a more specific search on SO, maybe it was deleted.

The question was like: I wrote "hello world" but I get some compile errors, followed by an image embed of a handwritten hello world program, followed by a compiler command where the input file had a .png extension and an error related to the compiler not being able to read PNG files, followed by quoting the part of the standard where it says the input file shall be readable text and this is obviously readable text because I can read it.