runtime/race: missed race on []Struct

[dvyukov]

The race in the following test is not detected, because slice operations imitate
accesses only to the beginning of each element, so it detects similar race on x[1].x but
not on x[1].y.

func TestRaceFailingSliceStruct(t *testing.T) {
    type X struct {
        x, y int
    }
    c := make(chan bool, 1)
    x := make([]X, 10)
    go func() {
        y := make([]X, 10)
        copy(y, x)
        c <- true
    }()
    x[1].y = 42
    <-c
}

[rsc]

Comment 1:

Marking all race detector bugs as Go1.1Maybe, not because they're unimportant but
because I don't expect non-dvyukov contributors to look at them.

Labels changed: added go1.1maybe, removed go1.1.

[rsc]

Comment 2:

[The time for maybe has passed.]

Labels changed: removed go1.1maybe.

[robpike]

Comment 3:

Labels changed: added go1.2maybe.

[dvyukov]

Comment 4:

This issue was closed by revision cc99e6e.

Status changed to Fixed.