unicode/utf8: use binary literals

We were using hex literals and had the binary literal in a comment.
When I was working with this code, I always referred to the comment.
That's an indicator that we should just use the binary literal directly.

Updates #19308

Change-Id: I2279cb8efb4ae5f2e1558c15979058ab09eb4f6f
Reviewed-on: https://go-review.googlesource.com/c/go/+/173663
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/unicode/utf8/utf8.go b/src/unicode/utf8/utf8.go
index b351cc351f914a0f78da13824ba8a7e289486f85..2d4a48625659a991da91eb181ac673a1f0f07187 100644 (file)
--- a/src/unicode/utf8/utf8.go
+++ b/src/unicode/utf8/utf8.go
@@ -25,25 +25,25 @@ const (
 )
 
 const (
-       t1 = 0x00 // 0000 0000
-       tx = 0x80 // 1000 0000
-       t2 = 0xC0 // 1100 0000
-       t3 = 0xE0 // 1110 0000
-       t4 = 0xF0 // 1111 0000
-       t5 = 0xF8 // 1111 1000
+       t1 = 0b00000000
+       tx = 0b10000000
+       t2 = 0b11000000
+       t3 = 0b11100000
+       t4 = 0b11110000
+       t5 = 0b11111000
 
-       maskx = 0x3F // 0011 1111
-       mask2 = 0x1F // 0001 1111
-       mask3 = 0x0F // 0000 1111
-       mask4 = 0x07 // 0000 0111
+       maskx = 0b00111111
+       mask2 = 0b00011111
+       mask3 = 0b00001111
+       mask4 = 0b00000111
 
        rune1Max = 1<<7 - 1
        rune2Max = 1<<11 - 1
        rune3Max = 1<<16 - 1
 
        // The default lowest and highest continuation byte.
-       locb = 0x80 // 1000 0000
-       hicb = 0xBF // 1011 1111
+       locb = 0b10000000
+       hicb = 0b10111111
 
        // These names of these constants are chosen to give nice alignment in the
        // table below. The first nibble is an index into acceptRanges or F for