fmt: Add support for capital '%X' format verb for scanning
For printing, the format verb '%X' results in a capitalized hex-representation of the formatted value. Conversely, using '%X' in a Scanf function should scan a hex-representation into the given interface{}. The existing implementation however only supports '%X' for scanning hex values into integers; strings or byte slices remain empty. On the other hand, lower-case '%x' supports strings and byte slices just fine. This is merely an oversight, which this commit fixes. (Additional tests also included.) Fixes #12940 Change-Id: I178a7f615bae950dfc014ca8c0a038448cf0452a Reviewed-on: https://go-review.googlesource.com/15689Reviewed-by:Andrew Gerrand <adg@golang.org>
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