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Fixes #18583. ## Problem Several stdlib collection types compute the separator for `$` using `result.len > 1`, where `result` starts as the opening bracket (`"["` or `"{"`). This breaks when a collection element type has a `$` that returns an empty string: `result.len` stays at 1 after the first item contributes nothing, so the separator is never inserted for subsequent items. ```nim import std/deques type Test = object proc `$`(x: Test): string = "" echo [Test(), Test()].toDeque # prints [] — expected [, ] ``` ## Fix Replace the length check with an explicit `first` flag in all affected modules: `deques`, `heapqueue`, `lists`, `critbits`, and `strtabs`. ## Tests Regression tests added to `tdeques`, `theapqueue`, and `tlists` using a local type whose `$` returns `""`. All three test files pass with `nim c -r`. ## Notes I work with Claude as a co-processor. I'm 56, came to programming late, and this is genuinely how I learn and contribute. I understand what I'm submitting, but I didn't write it alone. If your project prefers human-only contributions, just say so and I'll close without friction. --------- Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
This directory contains the test cases.
Each test must have a filename of the form: t*.nim
Note: Testament is only aware of tests under a directory (eg tests/foo/) and will ignore
top-level tests like tests/tbar.nim.
Specs
Each test can contain a spec in a discard """ ... """ block.
Check out the parseSpec procedure in the specs module for a full and reliable reference
action
Specifies what action this test should take.
Default: run
Options:
compile- compiles the module and fails the test if compilations fails.run- compiles and runs the module, fails the test if compilation or execution of test code fails.reject- compiles the module and fails the test if compilation succeeds.
There are certain spec keys that imply run, including output and
outputsub.
Categories
Each folder under this directory represents a test category, which can be
tested by running koch tests pcat <category> (or cat to avoid parallel
testing, which is slower).
The folder dll contains simple DLL tests.
The folder realtimeGC contains a test for validating that the realtime GC
can run properly without linking against the nimrtl.dll/so.