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Diffstat (limited to 'src/strings/builder_test.go')
| -rw-r--r-- | src/strings/builder_test.go | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/strings/builder_test.go b/src/strings/builder_test.go index c0c8fa4130..ecbaeaa5c1 100644 --- a/src/strings/builder_test.go +++ b/src/strings/builder_test.go @@ -180,6 +180,18 @@ func TestBuilderAllocs(t *testing.T) { if allocs > 0 { t.Fatalf("got %d alloc(s); want 0", allocs) } + + // Issue 23382; verify that copyCheck doesn't force the + // Builder to escape and be heap allocated. + n := testing.AllocsPerRun(10000, func() { + var b Builder + b.Grow(5) + b.WriteString("abcde") + _ = b.String() + }) + if n != 1 { + t.Errorf("Builder allocs = %v; want 1", n) + } } func numAllocs(fn func()) uint64 { |