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doc: add illegal octal over 255 example 

Octal values over 255, like \400 or \777, are illegal.  It wasn't clear if the expected behavior was a compile error, encoding the value as two characters, or if the value would be capped at 255.

This example explicitly shows that octal values over 255 are illegal.

Change-Id: I45d94680107029c5f083e5d434e6270cc5b258c1
GitHub-Last-Rev: f6bef0379f
GitHub-Pull-Request: golang/go#52111
Reviewed-on: https://go-review.googlesource.com/c/go/+/397555
Reviewed-by: Robert Griesemer <gri@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
This commit is contained in:
Zach Collier 2022-04-01 23:42:12 +00:00 committed by Emmanuel Odeke
parent 8a816d5efc
commit 01c83be793
1 changed files with 1 additions and 0 deletions
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@ -529,6 +529,7 @@ escaped_char = `\` ( "a" | "b" | "f" | "n" | "r" | "t" | "v" | `\` | "'" | `
'aa' // illegal: too many characters
'\xa' // illegal: too few hexadecimal digits
'\0' // illegal: too few octal digits
'\400' // illegal: octal value over 255
'\uDFFF' // illegal: surrogate half
'\U00110000' // illegal: invalid Unicode code point
</pre>