Gfortran randomly failed to create valid *.mod files based on the module name

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The *.mod files produced by Gfortran are run-of-the-mill text files compressed by gzip. You can do

gzip -cd utils.mod

and you should see something similar to

GFORTRAN module version '15' created from module.f90
(() () () () () () () () () () () () () () () () () () () () () () () ()
() () ())

()

()

()

()

()

(2 'say_hello' 'utils' '' 1 ((PROCEDURE UNKNOWN-INTENT MODULE-PROC DECL
UNKNOWN 0 0 SUBROUTINE) () (UNKNOWN 0 0 0 0 UNKNOWN ()) 0 0 () () 0 () ()
() 0 0)
3 'utils' 'utils' '' 1 ((MODULE UNKNOWN-INTENT UNKNOWN-PROC UNKNOWN
UNKNOWN 0 0) () (UNKNOWN 0 0 0 0 UNKNOWN ()) 0 0 () () 0 () () () 0 0)
)

('say_hello' 0 2 'utils' 0 3)
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