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b61d7ec16b
The standard requires that dummy arguments to PURE functions be INTENT(IN) or VALUE, but PURE subroutines are allowed to have modifiable dummy arguments. This makes it impossible to declare atomic operations as PURE functions, which consequently makes such atomic operations ineligible for use in parallel constructs and DO CONCURRENT. This patch downgrades this error to a warning by default, which can be seen with -pedantic & al. and remain an error with -Werror.