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reflect: update CanAddr, CanSet documentation
CanAddr was wrong, out of date; CanSet was incomplete. R=r CC=golang-dev https://golang.org/cl/4442066
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@ -395,8 +395,7 @@ func (v Value) Bool() bool {
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// CanAddr returns true if the value's address can be obtained with Addr.
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// Such values are called addressable. A value is addressable if it is
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// an element of a slice, an element of an addressable array,
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// a field of an addressable struct, the result of dereferencing a pointer,
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// or the result of a call to NewValue, MakeChan, MakeMap, or Zero.
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// a field of an addressable struct, or the result of dereferencing a pointer.
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// If CanAddr returns false, calling Addr will panic.
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func (v Value) CanAddr() bool {
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iv := v.internal()
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@ -404,8 +403,8 @@ func (v Value) CanAddr() bool {
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}
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// CanSet returns true if the value of v can be changed.
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// Values obtained by the use of unexported struct fields
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// can be read but not set.
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// A Value can be changed only if it is addressable and was not
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// obtained by the use of unexported struct fields.
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// If CanSet returns false, calling Set or any type-specific
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// setter (e.g., SetBool, SetInt64) will panic.
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func (v Value) CanSet() bool {
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