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This patch adds ISO_Fortran_Env's LOCK_TYPE, tons of constraint checks and a simple implementation for -fcoarray=single.
With the implementation of LOCK_TYPE and (UN)LOCK, gfortran can now parse all coarrays constructs of Fortran 2008. (However, there are still known deficits and bugs in the resolving/code-producing stage; for instance, allocatable scalar coarrays are not yet implemented.)
Build and regtested on x86-64-linux. OK for the trunk?
Tobias
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