foo_test.go

package main

import (
	"fmt"
	"testing"
)

func TestFoo(t *testing.T) {
	t.Parallel()

	tests1 := []struct {
		name string
		v    string
	}{
		{"outer1-1", "outer1-1"},
		{"outer1-2", "outer1-2"},
	}

	tests2 := []struct {
		name string
		v    string
	}{
		{"outer2-1", "outer2-1"},
		{"outer2-2", "outer2-2"},
	}

	for _, tt1 := range tests1 {
		tt1 := tt1
		t.Run(tt1.name, func(t *testing.T) {
			for _, tt2 := range tests2 {
				tt2 := tt2
				t.Run(tt2.name, func(t *testing.T) {
					t.Parallel()

					fmt.Println(tt1.v, tt2.v)
				})
			}
		})
	}
}

$ ./bin/paralleltest .
[...]/foo_test.go:27:2: Range statement for test TestFoo does not reinitialise the variable tt2

using paralleltest 1.0.3:

> grep paralleltest go.*
go.mod: github.com/kunwardeep/paralleltest v1.0.3
go.sum:github.com/kunwardeep/paralleltest v1.0.3 h1:UdKIkImEAXjR1chUWLn+PNXqWUGs//7tzMeWuP7NhmI=
go.sum:github.com/kunwardeep/paralleltest v1.0.3/go.mod h1:vLydzomDFpk7yu5UX02RmP0H8QfRPOV/oFhWN85Mjb4=