The file https://drive.google.com/file/d/1L1KBWyuoeKUBpiR94i6m3LmUsKu1fJWz/view?usp=sharing is a cleaned-up version of file acdcc.f in the BVPTest package that may be downloaded from https://archimede.uniba.it/~bvpsolvers/testsetbvpsolvers/?page_id=27 .
Without /64, using the FTN95 8.97 compiler, the test file compiles with no warnings or errors. With /64, however, a number of spurious warnings are issued:
S:\ALGO\ODE\BVPTest\bvpTestSet\fortransrc\drivers>ftn95 /64 buggy.f
[FTN95/x64 Ver. 8.97.2 Copyright (c) Silverfrost Ltd 1993-2023]
NO ERRORS [<ACDCCD> FTN95 v8.97.2]
NO ERRORS [<ODEF> FTN95 v8.97.2]
NO ERRORS [<ODEJAC> FTN95 v8.97.2]
NO ERRORS [<GSUB> FTN95 v8.97.2]
NO ERRORS [<DGSUB> FTN95 v8.97.2]
NO ERRORS [<FNUMJAC> FTN95 v8.97.2]
NO ERRORS [<BCNUMJAC> FTN95 v8.97.2]
WARNING S:\ALGO\ODE\BVPTest\bvpTestSet\fortransrc\drivers\buggy.F 505: In a call to APPREFSOL from another procedure, the sixth argument was of type REAL(KIND=2), it is now REAL(KIND=2)
WARNING S:\ALGO\ODE\BVPTest\bvpTestSet\fortransrc\drivers\buggy.F 505: In a call to APPREFSOL from another procedure, the seventh argument was of type REAL(KIND=2), it is now REAL(KIND=2)
WARNING S:\ALGO\ODE\BVPTest\bvpTestSet\fortransrc\drivers\buggy.F 505: In a call to APPREFSOL from another procedure, the 13th argument was of type REAL(KIND=2), it is now REAL(KIND=2)
WARNING S:\ALGO\ODE\BVPTest\bvpTestSet\fortransrc\drivers\buggy.F 505: In a call to APPREFSOL from another procedure, the 15th argument was of type INTEGER(KIND=3), it is now INTEGER(KIND=3)
NO ERRORS, 4 WARNINGS [<APPREFSOL> FTN95 v8.97.2]
Note that in each of the four warnings, the 'was' type and the 'now' type are identical!