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Add test case for jsffi type mismatch error (#16726) (#25429)

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Issue #16726 reported an internal compiler error (`semcall.nim(229, 18)
nArg != nil`) when calling `toJs` with invalid arguments. The bug has
been fixed in the current codebase but lacked a regression test.

```nim
import std/jsffi
let a = toJs(3)
let b = a.toJs(int)  # Now produces: Error: type mismatch
                      # Previously: internal error
```

**Changes:**
- Added `tests/js/t16726.nim` to verify proper type mismatch error is
reported instead of internal compiler error

<!-- START COPILOT ORIGINAL PROMPT -->

<details>

<summary>Original prompt</summary>

>
> ----
>
> *This section details on the original issue you should resolve*
>
> <issue_title>internal error: semcall.nim(229, 18) nArg !=
nil</issue_title>
> <issue_description>### Example
> the code below should give a clean CT error, not an internal error
> ```nim
> import std/jsffi
> let a = toJs(3)
> let b = a.toJs(int)
> ```
>
> ### Current Output
> nim r -b:js main
> compiler/semcall.nim(229, 18) `nArg != nil`
>
> ### Expected Output
> proper CT error
>
> ### Additional Information
> 1.5.1 41965880ce
> </issue_description>
>
> <agent_instructions>adds a test case for it and verify it by `./koch
temp js -r test.nim` before committing</agent_instructions>
>
> ## Comments on the Issue (you are @copilot in this section)
>
> <comments>
> <comment_new><author>@ringabout</author><body>
> related:
https://github.com/nim-lang/Nim/issues/15607</body></comment_new>
> </comments>
>

</details>

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- Fixes nim-lang/Nim#16726

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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: ringabout <43030857+ringabout@users.noreply.github.com>
(cherry picked from commit 83d7d8c634)
This commit is contained in:
Copilot
2026-01-10 21:18:39 +08:00
committed by narimiran
parent a21a1c99cd
commit e45bef46a1
1 changed files with 9 additions and 0 deletions
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tests/js/t16726.nim Normal file
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discard """
errormsg: "type mismatch"
"""
# issue #16726
# the code below should give a clean CT error, not an internal error
import std/jsffi
let a = toJs(3)
let b = a.toJs(int)