538b3a5f37
According to the language spec, a struct field name should
be an identifier.
identifier = letter { letter | unicode_digit } .
letter = unicode_letter | "_" .
Implements a function 'isValidFieldName(fieldName string) bool'.
To check if the field name is a valid identifier or not.
It will panic if the field name is invalid.
It uses the non-exported function implementation 'isLetter'
from the package 'scanner', used to parse an identifier.
Fixes #20600.
Change-Id: I1db7db1ad88cab5dbea6565be15cc7461cc56c44
Reviewed-on: https://go-review.googlesource.com/45590
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
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