Function has no implicit type

by

Move the line 

end program

to the end of your source file and, in its place, write the line

contains

As you have written your program it has no knowledge of the function test, which is what the compiler is telling you. I have suggested one of the ways in which you can provide the program with the knowledge it needs, but there are others. Since you are a learner I’ll leave you to figure out what’s going on in detail.

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