vim9: misleading error message

[Ernie Rael]

Run this shell command

   vim -Nu NONE -S <(tee <<'EOF'
        vim9script
        def X(f: func): any
            return f()
        enddef
        echo X(() => "HERE")
   EOF
   )

An error is given

   E117: Unknown function: f

Expected

Either it works. Or a better error message is given. Perhaps

   E1267: Function name must start with a capital: f()

[Bram Moolenaar]

Right. We can use the existing error E704.

--
Facepalm statement #2: "If there is a country without immigrants I'm going to
move there"

/// Bram Moolenaar -- Br...@Moolenaar.net -- http://www.Moolenaar.net \\\
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