}
	if coverCounters[fileName] != nil {
		// Already registered.
		return
	}
	coverCounters[fileName] = counter
	block := make([]testing.CoverBlock, len(counter))
	for i := range counter {
		block[i] = testing.CoverBlock{
			Line0: pos[3*i+0],
			Col0: uint16(pos[3*i+2]),
			Line1: pos[3*i+1],
			Col1: uint16(pos[3*i+2]>>16),
			Stmts: numStmts[i],
		}
	}

		{"Cover.Counters", Field, 2},
		{"Cover.CoveredPackages", Field, 2},
		{"Cover.Mode", Field, 2},
		{"CoverBlock", Type, 2},
		{"CoverBlock.Col0", Field, 2},
		{"CoverBlock.Col1", Field, 2},
		{"CoverBlock.Line0", Field, 2},
		{"CoverBlock.Line1", Field, 2},
		{"CoverBlock.Stmts", Field, 2},
		{"CoverMode", Func, 8},
		{"Coverage", Func, 4},
		{"F", Type, 18},
		{"Init", Func, 13},