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declaration within implied do loop


I think the code


program implied_do_declaration
implicit none
integer, allocatable :: vec(:)
vec = [(2*i, integer :: i=1,3)]
print*,vec ! 2 4 6
end program implied_do_declaration


is valid Fortran 2018 but Intel Fortran says


ifort -standard-semantics -stand:f18 implied_do.f90
Intel(R) Fortran Intel(R) 64 Compiler Classic for applications running on Intel(R) 64, Version 2021.5.0 Build 20211109_000000
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implied_do.f90(4): error #6404: This name does not have a type, and must have an explicit type. [I]
vec = [(2*i, integer :: i=1,3)]
compilation aborted for implied_do.f90 (code 1)

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