Patch #1303: Adapt str8 constructor to bytes (now buffer) one.
diff --git a/Lib/test/test_struct.py b/Lib/test/test_struct.py
index 7942045..d2b5643 100644
--- a/Lib/test/test_struct.py
+++ b/Lib/test/test_struct.py
@@ -101,7 +101,7 @@
 simple_err(struct.unpack, 'iii', s)
 simple_err(struct.unpack, 'i', s)
 
-c = str8('a')
+c = str8(b'a')
 b = 1
 h = 255
 i = 65535
@@ -186,7 +186,7 @@
         if isinstance(arg, str):
             # Strings are returned as str8 since you can't know the encoding of
             # the string when packed.
-            arg = str8(arg)
+            arg = str8(arg, 'latin1')
         if rev != arg and not asy:
             raise TestFailed("unpack(%r, %r) -> (%r,) # expected (%r,)" % (
                 fmt, res, rev, arg))
@@ -428,14 +428,14 @@
 
 def test_p_code():
     for code, input, expected, expectedback in [
-            ('p','abc', '\x00', str8('')),
-            ('1p', 'abc', '\x00', str8('')),
-            ('2p', 'abc', '\x01a', str8('a')),
-            ('3p', 'abc', '\x02ab', str8('ab')),
-            ('4p', 'abc', '\x03abc', str8('abc')),
-            ('5p', 'abc', '\x03abc\x00', str8('abc')),
-            ('6p', 'abc', '\x03abc\x00\x00', str8('abc')),
-            ('1000p', 'x'*1000, '\xff' + 'x'*999, str8('x'*255))]:
+            ('p','abc', '\x00', str8()),
+            ('1p', 'abc', '\x00', str8()),
+            ('2p', 'abc', '\x01a', str8(b'a')),
+            ('3p', 'abc', '\x02ab', str8(b'ab')),
+            ('4p', 'abc', '\x03abc', str8(b'abc')),
+            ('5p', 'abc', '\x03abc\x00', str8(b'abc')),
+            ('6p', 'abc', '\x03abc\x00\x00', str8(b'abc')),
+            ('1000p', 'x'*1000, '\xff' + 'x'*999, str8(b'x'*255))]:
         expected = bytes(expected, "latin-1")
         got = struct.pack(code, input)
         if got != expected:
@@ -564,20 +564,24 @@
         if verbose:
             print("test_unpack_from using", cls.__name__)
         data = cls(test_string)
-        vereq(s.unpack_from(data), (str8('abcd'),))
-        vereq(s.unpack_from(data, 2), (str8('cd01'),))
-        vereq(s.unpack_from(data, 4), (str8('0123'),))
+        if not isinstance(data, (str8, bytes)):
+            bytes_data = str8(data, 'latin1')
+        else:
+            bytes_data = data
+        vereq(s.unpack_from(data), (str8(b'abcd'),))
+        vereq(s.unpack_from(data, 2), (str8(b'cd01'),))
+        vereq(s.unpack_from(data, 4), (str8(b'0123'),))
         for i in range(6):
-            vereq(s.unpack_from(data, i), (str8(data[i:i+4]),))
+            vereq(s.unpack_from(data, i), (bytes_data[i:i+4],))
         for i in range(6, len(test_string) + 1):
             simple_err(s.unpack_from, data, i)
     for cls in (str, str8, bytes): # XXX + memoryview
         data = cls(test_string)
-        vereq(struct.unpack_from(fmt, data), (str8('abcd'),))
-        vereq(struct.unpack_from(fmt, data, 2), (str8('cd01'),))
-        vereq(struct.unpack_from(fmt, data, 4), (str8('0123'),))
+        vereq(struct.unpack_from(fmt, data), (str8(b'abcd'),))
+        vereq(struct.unpack_from(fmt, data, 2), (str8(b'cd01'),))
+        vereq(struct.unpack_from(fmt, data, 4), (str8(b'0123'),))
         for i in range(6):
-            vereq(struct.unpack_from(fmt, data, i), (str8(data[i:i+4]),))
+            vereq(struct.unpack_from(fmt, data, i), (bytes_data[i:i+4],))
         for i in range(6, len(test_string) + 1):
             simple_err(struct.unpack_from, fmt, data, i)