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parsefile
Combined from primary sources listed below.

In Grammar§

See primary documentation in context for method parsefile 

method parsefile(Str(Cool) $filename, :$enc, *%opts)

Reads file $filename encoding by $enc, and parses it. All named arguments are passed on to method parse.

grammar Identifiers {
    token TOP        { [<identifier><.ws>]+ }
    token identifier { <initial> <rest>* }
    token initial    { <+myletter +[_]> }
    token rest       { <+myletter +mynumber +[_]> }
    token myletter   { <[A..Za..z]> }
    token mynumber   { <[0..9]> }
}

say Identifiers.parsefile('users.txt', :enc('UTF-8'))
    .Str.trim.subst(/\n/, ',', :g);

# users.txt :
# TimToady
# lizmat
# jnthn
# moritz
# zoffixznet
# MasterDuke17

# OUTPUT: «TimToady,lizmat,jnthn,moritz,zoffixznet,MasterDuke17␤»