doc/ref/spec.md: add missing binary_digits

Fixes #765 Change-Id: Id29149a7146d428766833beb6eca071770215d1d Reviewed-on: https://cue-review.googlesource.com/c/cue/+/8704 Reviewed-by: Marcel van Lohuizen <mpvl@golang.org> Reviewed-by: CUE cueckoo <cueckoo@gmail.com>
cue-lang · Feb 13, 2021 · 500e431 · 500e431
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commit 500e431
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diff --git a/doc/ref/spec.md b/doc/ref/spec.md
@@ -127,6 +127,7 @@ The underscore character _ (U+005F) is considered a letter.
 ```
 letter        = unicode_letter | "_" .
 decimal_digit = "0" … "9" .
+binary_digit  = "0" … "1" .
 octal_digit   = "0" … "7" .
 hex_digit     = "0" … "9" | "A" … "F" | "a" … "f" .
 ```