Nim: Unexpected import required

[ralsina]

Building this program:

import xmltree

type
        Drawing* = tuple[fname: string, document: XmlNode]

proc NewDrawing*(fname: string, height:string="100", width:string="100"): Drawing =
        result = (
            fname: fname,
            document: <>svg(width=width, height=height)
        )

when isMainModule:
        var d = NewDrawing("foo.svg")

Fails with this error:

svg1.nim(9, 19) template/generic instantiation from here
lib/nim/core/macros.nim(556, 26) Error: undeclared identifier: 'newStringTable'

This is with both git HEAD and with latest release:

nim --version                                           
Nim Compiler Version 0.18.1 [Linux: amd64]
Copyright (c) 2006-2018 by Andreas Rumpf

git hash: 9d77f61038ddabeb4b59847d709e6d722e743082
active boot switches: -d:release -d:nativeStackTrace

[data-man]

Just add strtabs to import.

[mratsim]

This is due to the macro pasting newStringTable at the instantiation site (contrary to proc). You can work around it by adding strtabs like data-man said.

I think xmltree should at least export this proc though or call it internally in a proc and not a macro to avoid this issue.

[ralsina]

I know how to work around it. I wrote a blog post about this and @nim-lang on twitter told me to report the bug.

[data-man]

@Araq
May I fix it?
Also, StringTable returned as result in the modules:
scgi.nim
mimetypes.nim
smtp.nim
xmlparser.nim
htmlparser.nim
cgi.nim
cookies.nim
httpserver.nim