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Already on GitHub? Sign in to your account macro cannot handle ambiguous types even in a full form (module.Type) #11057

syhpoon opened this issue Apr 18, 2019 · 0 comments


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commented Apr 18, 2019

When a file imports several modules with ambiguous types, macro doesn't seem to be able to produce correct code for compiler to digest.



import json
import req1, req2

let raw = parseJson("""{"a": "test"}""")
let obj = to(raw, req1.Test)


   Test* = object
      a*: string


   Test* = object
      a*: string

Current Outcome

nim c main.nim

main.nim(6, 13) template/generic instantiation from here
~/.choosenim/toolchains/nim-0.19.4/lib/pure/json.nim(1451, 33) Error: ambiguous identifier: 'Test' --use req1.Test or req2.Test

The workaround like:

type T = req1.Test
let obj = to(raw, T)

works, but it smells a bit hacky.

Expected Outcome

File successfully compiled

Additional Information

$ nim -v
Nim Compiler Version 0.19.4 [Linux: amd64]
Compiled at 2019-02-01
Copyright (c) 2006-2018 by Andreas Rumpf

git hash: b6d96cafc8bcad1f3d32f2910b25cd11a93f7751

Araq added a commit that referenced this issue May 28, 2019

@Araq Araq closed this in 9d8b4d6 May 28, 2019

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