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math/big: document that Rat.Denom might modify the receiver

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Fixes #33792

Change-Id: I306a95883c3db2d674d3294a6feb50adc50ee5d6
Reviewed-on: https://go-review.googlesource.com/c/go/+/192017
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Eric Lagergren 2019-08-27 19:32:17 -07:00 committed by Robert Griesemer
parent 307544f427
commit 9dfa4cb026
1 changed files with 2 additions and 0 deletions
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src/math/big/rat.go
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@ -413,6 +413,8 @@ func (x *Rat) Num() *Int {
// Denom returns the denominator of x; it is always > 0.
// The result is a reference to x's denominator; it
// may change if a new value is assigned to x, and vice versa.
// If x's denominator is 1, Denom may materialize the denominator, thereby
// modifying x.
func (x *Rat) Denom() *Int {
x.b.neg = false // the result is always >= 0
if len(x.b.abs) == 0 {