Allow declaration of return type of functions like real*8 sqrt about lfortran HOT 5 CLOSED

It will work if you use --implicit-interface.
@certik shall we make it so that it does not need that option anymore?

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Yes, in ASR it's just sqrt.

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I missed the part that sqrt was declared as a variable. This definitely should not be allowed by default. However, LFortran must give a nice error message saying "sqrt was declared as a variable, it can't be called as a function".

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I feel real*8 sqrt is indicating to use dsqrt i.e. return type will be double precision real number. we have a similar case for entry function, where double precision :: a denotes the return type of entry function.

subroutine sub()
double precision :: a

entry a()
print *, "entry function"
return
end subroutine

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Closing with reference to #2395.

from lfortran.