variadic parameter must be of unnamed slice type

[hlalibe]

Struggling with the following code (which i simplified),
Error is on line: book_up_data = append(book_up_data, stringup)
If i comment it out, works ok.
Error message is: types.NewSignature: variadic parameter must be of unnamed slice type

//create empty slice for up data
var book_up_data plotter.Values

//read 60 rows of up data and append together in slice
j := 1
for j <= 60 {
    stringup, err := strconv.ParseFloat(df[i+j-1][16], 64)
    if err != nil {
        panic(err)
    }
    book_up_data = append(book_up_data, stringup)

    //move to next row
    j = j + 1
}

I've researched the topic of variadic parameters and unnamed slice type and tried to change the definition of book_up_data, but no results. The overall code is meant to prepare data to produce a chart. df is created by reading the content of an excel file, works nicely. No error messages when running program from terminal.

[sbinet]

does it work if you replace it with:

book_up_data = append(book_up_data, plotter.Value{stringup}...)

[hlalibe]

I then get for that same line:
repl.go:11:41: not a type: plotter.Value <*ast.SelectorExpr>

[hlalibe]

Just realised, you missed the s I think at the end of plotter.Values.
So if I use book_up_data = append(book_up_data, plotter.Values{stringup}...)
then i get the same error as my first post:
types.NewSignature: variadic parameter must be of unnamed slice type

[SpencerPark]

I think this is a gomacro bug so I'll bring @cosmos72 into the discussion here.

Using a type around a slice with variadic signatures is not allowed by types. See types.NewSignature.

The following doesn't work:

type T []float64
var t T
append(t, 1.0)

where as this does

type T []float64
- var t T
+ var t []float64
append(t, 1.0)

[cosmos72]

Thanks for the extremely short code showing the problem, it made fixing it much easier :)

[hlalibe]

thanks @cosmos72 , it's working fine on my side now.