Something not OK

[d-enk]

tinygo version 0.38.0 linux/amd64 (using go version go1.24.4 and LLVM version 19.1.2)

Managed to simplify it to such a reproducer

-- go.mod --
module test

go 1.18
-- test_test.go --

package main

import (
	"testing"
)

type Label struct{}

type Item[T any] struct {
	Value  T
	Labels []Label
}

func run[T any](input <-chan Item[T]) {
	for item := range input {
		if len(item.Labels) != 0 {
			panic(len(item.Labels))
		}
	}
}

func NotUsed() {
	type T struct{ any }

	run[T](nil)
}

func Benchmark(b *testing.B) {
	type T struct{}

	items := make(chan Item[T])

	go func() {
		for i := 0; i < b.N; i++ {
			items <- Item[T]{Labels: nil}
		}

		close(items)
	}()

	run(items)
}

tinygo test -benchmem -run=^$ -bench ^ -v -count=1

panic: 2284738
FAIL  test  1.149s