prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Release 2.1.66
  On the docket:
  + [x] Support specifying foreign platforms in full detail. #1597
  + [x]  Respect PEX_ROOT in PEXEnvironment.mount. #1599 
  + [x]  Be able to see what .pex file is run from the list of system processes #1604 
  
  </issue>
  <code>
  [start of pex/version.py]
  1 # Copyright 2015 Pants project contributors (see CONTRIBUTORS.md).
  2 # Licensed under the Apache License, Version 2.0 (see LICENSE).
  3 
  4 __version__ = "2.1.65"
  5
  [end of pex/version.py]
  </code>
  
  I need you to solve this issue by generating a single patch file that I can apply directly to this repository using git apply. Please respond with a single patch file in the following format.
  <patch>
  diff --git a/file.py b/file.py
  --- a/file.py
  +++ b/file.py
  @@ -1,27 +1,35 @@
   def euclidean(a, b):
  -    while b:
  -        a, b = b, a % b
  -    return a
  +    if b == 0:
  +        return a
  +    return euclidean(b, a % b)
   
   
   def bresenham(x0, y0, x1, y1):
       points = []
       dx = abs(x1 - x0)
       dy = abs(y1 - y0)
  -    sx = 1 if x0 < x1 else -1
  -    sy = 1 if y0 < y1 else -1
  -    err = dx - dy
  +    x, y = x0, y0
  +    sx = -1 if x0 > x1 else 1
  +    sy = -1 if y0 > y1 else 1
   
  -    while True:
  -        points.append((x0, y0))
  -        if x0 == x1 and y0 == y1:
  -            break
  -        e2 = 2 * err
  -        if e2 > -dy:
  -            err -= dy
  -            x0 += sx
  -        if e2 < dx:
  -            err += dx
  -            y0 += sy
  +    if dx > dy:
  +        err = dx / 2.0
  +        while x != x1:
  +            points.append((x, y))
  +            err -= dy
  +            if err < 0:
  +                y += sy
  +                err += dx
  +            x += sx
  +    else:
  +        err = dy / 2.0
  +        while y != y1:
  +            points.append((x, y))
  +            err -= dx
  +            if err < 0:
  +                x += sx
  +                err += dy
  +            y += sy
  +
  +    points.append((x, y))
       return points
  
  </patch>
golden_diff: diff --git a/pex/version.py b/pex/version.py
  --- a/pex/version.py
  +++ b/pex/version.py
  @@ -1,4 +1,4 @@
   # Copyright 2015 Pants project contributors (see CONTRIBUTORS.md).
   # Licensed under the Apache License, Version 2.0 (see LICENSE).
   
  -__version__ = "2.1.65"
  +__version__ = "2.1.66"
  
verification_info: {"golden_diff": "diff --git a/pex/version.py b/pex/version.py\n--- a/pex/version.py\n+++ b/pex/version.py\n@@ -1,4 +1,4 @@\n # Copyright 2015 Pants project contributors (see CONTRIBUTORS.md).\n # Licensed under the Apache License, Version 2.0 (see LICENSE).\n \n-__version__ = \"2.1.65\"\n+__version__ = \"2.1.66\"\n", "issue": "Release 2.1.66\nOn the docket:\r\n+ [x] Support specifying foreign platforms in full detail. #1597\r\n+ [x]  Respect PEX_ROOT in PEXEnvironment.mount. #1599 \r\n+ [x]  Be able to see what .pex file is run from the list of system processes #1604 \n", "before_files": [{"content": "# Copyright 2015 Pants project contributors (see CONTRIBUTORS.md).\n# Licensed under the Apache License, Version 2.0 (see LICENSE).\n\n__version__ = \"2.1.65\"\n", "path": "pex/version.py"}]}