10.2 #compiler

The template:

// Not a comment
#compiler commentStartToken = '//'
// A comment
#compiler reset
// Not a comment

The output:

// Not a comment
// Not a comment

The generated code:

write('// Not a comment\n')
#  A comment
write('// Not a comment\n')

So this didn't affect the generated program, it just affected how the template definition was read.