scanner: handle carriage return in comments (#656)

Fixes #653

scanner.go

@@ -149,6 +149,12 @@ func scanComment(b []byte) ([]byte, []byte, error) {
 		if b[i] == '\n' {
 			return b[:i], b[i:], nil
 		}
+		if b[i] == '\r' {
+			if i+1 < len(b) && b[i+1] == '\n' {
+				return b[:i+1], b[i+1:], nil
+			}
+			return nil, nil, newDecodeError(b[i:i+1], "invalid character in comment")
+		}
 		size := utf8ValidNext(b[i:])
 		if size == 0 {
 			return nil, nil, newDecodeError(b[i:i+1], "invalid character in comment")

unmarshaler_test.go

@@ -1557,6 +1557,18 @@ B = "data"`,
 				}
 			},
 		},
+		{
+			desc:  "comment with CRLF",
+			input: "# foo\r\na=2",
+			gen: func() test {
+				doc := map[string]interface{}{}
+
+				return test{
+					target:   &doc,
+					expected: &map[string]interface{}{"a": int64(2)},
+				}
+			},
+		},
 	}
 
 	for _, e := range examples {
@@ -2219,6 +2231,14 @@ world'`,
 			desc: `carriage return inside basic string`,
 			data: "A = \"\r\"",
 		},
+		{
+			desc: `carriage return in comment`,
+			data: "# this is a test\ra=1",
+		},
+		{
+			desc: `backspace in comment`,
+			data: "# this is a test\ba=1",
+		},
 	}
 
 	for _, e := range examples {