Invalid C++ code generation for assignment operator for generic types

[BigEpsilon]

In certain situations, like in the following example, the compiler generates an invalid c++ code, where the parameters to the generated eq_XXX function have their template parameter missing.

Example

type 
    Vector*  {.importcpp: "std::vector", header: "vector".}[T] = object

proc initVector*[T](n: csize): Vector[T] 
    {.importcpp: "std::vector<'*0>(@)", header: "vector".}

proc `=`*[T](a: var Vector[T], b: Vector[T]) 
    {.importcpp: "operator=", header: "vector".}

var v1 = initVector[int](10)
var v2 : Vector[int]

v1 = v2

Current Output

Error: execution of an external compiler program 'g++ -c  -w -w -fpermissive  -I'/home/user/.choosenim/toolchains/nim-#devel/lib' -I/home/user/dev/nim/tests/play/src -o /home/user/.cache/nim/play_d/play_play.cpp.o /home/user/.cache/nim/play_d/play_play.cpp' failed with exit code: 1

/home/user/.cache/nim/play_d/play_play.cpp:27:70: error: variable or field ‘eqsink__9aTJ5qWKS9aEaagmcvJV6NvA’ declared void
 N_LIB_PRIVATE N_NIMCALL(void, eqsink__9aTJ5qWKS9aEaagmcvJV6NvA)(std::vector& dest, std::vector src);
                                                                      ^
/home/user/.cache/nim/play_d/play_play.cpp:27:76: error: missing template arguments before ‘&’ token
 N_LIB_PRIVATE N_NIMCALL(void, eqsink__9aTJ5qWKS9aEaagmcvJV6NvA)(std::vector& dest, std::vector src);

...

Expected Output

No compilation error

Possible Solution

If someone give me a hint to where to look in the compiler code, I may try to correct this bug.

Additional Information

nim --version

Nim Compiler Version 0.19.9 [Linux: amd64]
Compiled at 2019-01-03
Copyright (c) 2006-2018 by Andreas Rumpf

active boot switches: -d:release

[cooldome]

Don't think your code is valid. You don't need to import cpp equal operator at all and the code should just work.

IMO, what should be done is the error message saying that = can't be an imported proc.

[BigEpsilon]

I was not sure that the = operator was invoked for copy so I preferred to make it explicit.

I agree with you that if = cannot be imported we need to make it clear with an error message. (also forbid template =)

[stale]

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