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reflect: explain why convertible or comparable types may still panic

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Conversions of slices to arrays may panic since the slice is too short.
Comparibility of interfaces may panic since the underlying value is incomparable.

This is a follow-up to CL 301652

Change-Id: Ia5d84a6e556a7b82c39add4be93ed7463e63cc8d
Reviewed-on: https://go-review.googlesource.com/c/go/+/327589
Trust: Joe Tsai <joetsai@digital-static.net>
Trust: Joe Tsai <thebrokentoaster@gmail.com>
Run-TryBot: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Katie Hockman <katie@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Joe Tsai 2021-06-12 12:25:12 -07:00 committed by Joe Tsai
parent 7841cb14d9
commit cf4e3e3d3b
1 changed files with 4 additions and 0 deletions
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4
src/reflect/type.go
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@ -107,10 +107,14 @@ type Type interface {
// ConvertibleTo reports whether a value of the type is convertible to type u. // ConvertibleTo reports whether a value of the type is convertible to type u.
// Even if ConvertibleTo returns true, the conversion may still panic. // Even if ConvertibleTo returns true, the conversion may still panic.
// For example, a slice of type []T is convertible to *[N]T,
// but the conversion will panic if its length is less than N.
ConvertibleTo(u Type) bool ConvertibleTo(u Type) bool
// Comparable reports whether values of this type are comparable. // Comparable reports whether values of this type are comparable.
// Even if Comparable returns true, the comparison may still panic. // Even if Comparable returns true, the comparison may still panic.
// For example, values of interface type are comparable,
// but the comparison will panic if their dynamic type is not comparable.
Comparable() bool Comparable() bool
// Methods applicable only to some types, depending on Kind. // Methods applicable only to some types, depending on Kind.