entry-statement (OB021)

This rule is turned on by default.

What it does

Checks for entry statements.

Why is this bad?

entry statements are an obsolescent feature allowing more than entry point into a procedure, enabling reuse of variables and executable statements. However, they make the code much harder to follow and are prone to bugs.

Multiple entry procedures can be replaced with modules to share data, and private module procedures to reuse code.

References

• Metcalf, M., Reid, J. and Cohen, M., 2018, _Modern Fortran Explained: Incorporating Fortran 2018, Oxford University Press, Appendix B 'Obsolescent and Deleted Features'