program_name syntax

[davidnz]

In the past I have successfully compiled Fortran programs with a program_name beginning with a numerical character, e.g.

      program 2test

When I used that syntax today I encountered the following error message:

error #5082: Syntax error, found INTEGER_CONSTANT '2' when expecting one of : <IDENTIFIER>

What is the correct syntax for a program_name in the program statement?

What could explain a change in compiler behaviour?

Thanks for any advice.

[JNichols · Accepted solution]

https://www.intel.com/content/www/us/en/develop/documentation/fortran-compiler-oneapi-dev-guide-and-reference/top/language-reference/program-elements-and-source-forms/names-1.html 

Search google intel Fortran names explains it -- google all questions like this as it is much faster