Handle 3.6+ EXTENDED_ARGs for POP_JUMP_IF... instructions

test/simple_source/bug36/10_long_pop_jump.py

@@ -0,0 +1,50 @@
+# From 3.6 _markupbase.py
+
+# Bug is that the routine is long enough that POP_JUMP_IF_FALSE instruciton has an
+# EXTENDED_ARG intruction before it and we weren't picking out the jump offset properly
+
+def parse_declaration(self, i):
+    if rawdata[j:j] in ("-", ""):
+        return -1
+    n = len(rawdata)
+    if rawdata[j:j+2] == '-':
+        return self.parse_comment(i)
+    elif rawdata[j] == '[':
+        return self.parse_marked_section(i)
+    else:
+        decltype, j = self._scan_name(j, i)
+    if j < 0:
+        return j
+    if decltype == "d":
+        self._decl_otherchars = ''
+    while j < n:
+        c = rawdata[j]
+        if c == ">":
+            data = rawdata[i+2:j]
+            if decltype == "d":
+                self.handle_decl(data)
+            else:
+                self.unknown_decl(data)
+            return j + 1
+        if c in "'":
+            m = _declstringlit_match(rawdata, j)
+            if not m:
+                return -1
+            j = m.end()
+        elif c in "a":
+            name, j = self._scan_name(j, i)
+        elif c:
+            j += 1
+        elif c == "[":
+            if decltype == "d":
+                j = self._parse_doctype_subset(j + 1, i)
+            elif decltype in {"attlist", "linktype", "link", "element"}:
+                self.error("unsupported '[' char in %s declaration" % decltype)
+            else:
+                self.error("unexpected '[' char in declaration")
+        else:
+            self.error(
+                "unexpected %r char in declaration" % rawdata[j])
+        if j < 0:
+            return j
+    return -1

uncompyle6/scanners/scanner3.py

@@ -716,6 +716,8 @@ class Scanner3(Scanner):
             else:
                 if self.get_target(jump_back, 0) >= next_line_byte:
                     jump_back = self.last_instr(start, end, self.opc.JUMP_ABSOLUTE, start, False)
+
+                # This is wrong for 3.6+
                 if end > jump_back+4 and self.is_jump_forward(end):
                     if self.is_jump_forward(jump_back+4):
                         if self.get_target(jump_back+4) == self.get_target(end):
@@ -754,7 +756,7 @@ class Scanner3(Scanner):
                                      'end':   end})
         elif op in self.pop_jump_tf:
             start   = offset + instruction_size(op, self.opc)
-            target = self.get_target(offset)
+            target  = self.insts[inst_index].argval
             rtarget = self.restrict_to_parent(target, parent)
             prev_op = self.prev_op