V: infix expr: cannot use `map_string_string` (right expression) as `x.json2.decode`

[danieldaeschle]

V version: V 0.1.29 aecdfb0
OS: Windows 10 WSL2 Ubuntu 20.04

What did you do?

import x.json2

fn main() {
    test := '{}'
    a := json2.decode<map[string]string>(test)
}

What did you expect to see?
works

What did you see instead?

test.v:5:19: error: infix expr: cannot use `map_string_string` (right expression) as `x.json2.decode`
    3 | fn main() {
    4 |     test := '{}'
    5 |     a := json2.decode<map[string]string>(test)
      |                      ^
    6 | }

[Delta456]

the error now:

main.v:5:2: warning: unused variable: `a`
    3 | fn main() {
    4 |     test := '{}'
    5 |     a := json2.decode<map[string]string>(test)
      |     ^
    6 | }
/code/root/v/vlib/x/json2/json2.v:30:6: error: unknown method: `map[string]string.from_json`
   28 |     }
   29 |     mut typ := T{}
   30 |     typ.from_json(res)
      |         ~~~~~~~~~~~~~~
   31 |     return typ
   32 | }

[danieldaeschle]

@nedpals can we make this work without from_json?

[nedpals]

@nedpals can we make this work without from_json?

I'm working on a codegen right now. I'll be posting the draft PR later.

[danieldaeschle]

Can you do it without compiler magic? Doing it with $for $if would be awesome!

[nedpals]

Thats my first idea but then there are lots of limitations when using $if and $for. No worries though, the codegen will be the same as the enum flag where it adds additional V code at the end.

[nedpals]

I'll be switching to comptime for and if similar to the docs once they're OK to use now

[danieldaeschle]

List what features we need in comptime, then we implement that first. Otherwise we have to refactor everytime.

[nedpals]

True. I'll be writing a separate issue for this to address the issues.