src: rename unexported errors by adding prefix err

By convention, use `err` as prefix for variables of type `error`.

Change-Id: I9401d5d47e994a27be245b2c8b1edd55cdd52db1
Reviewed-on: https://go-review.googlesource.com/c/go/+/467536
Auto-Submit: Ian Lance Taylor <iant@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Ian Lance Taylor <iant@google.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/src/encoding/binary/varint.go b/src/encoding/binary/varint.go
index 18e1ff1511..7b14fb2b63 100644
--- a/src/encoding/binary/varint.go
+++ b/src/encoding/binary/varint.go
@@ -123,7 +123,7 @@ func Varint(buf []byte) (int64, int) {
 	return x, n
 }
 
-var overflow = errors.New("binary: varint overflows a 64-bit integer")
+var errOverflow = errors.New("binary: varint overflows a 64-bit integer")
 
 // ReadUvarint reads an encoded unsigned integer from r and returns it as a uint64.
 // The error is EOF only if no bytes were read.
@@ -142,14 +142,14 @@ func ReadUvarint(r io.ByteReader) (uint64, error) {
 		}
 		if b < 0x80 {
 			if i == MaxVarintLen64-1 && b > 1 {
-				return x, overflow
+				return x, errOverflow
 			}
 			return x | uint64(b)<<s, nil
 		}
 		x |= uint64(b&0x7f) << s
 		s += 7
 	}
-	return x, overflow
+	return x, errOverflow
 }
 
 // ReadVarint reads an encoded signed integer from r and returns it as an int64.