prompt: You will be provided with a partial code base and an issue statement explaining a problem to resolve.
  <issue>
  Source installs no longer working
  #1614 made some changes to the packaging of modules to support the release package workflow.
  
  The wheels generated from this process appear to work fine; however, source installs don't appear to be working. I've had problems on both macOS and Android.
  
  **To Reproduce**
  Steps to reproduce the behavior:
  1. `briefcase run` or `briefcase run android` on Tutorial 0.
  
  **Expected behavior**
  
  App should start.
  
  **Environment:**
   - Operating System: macOS
   - Python version: 3.10
   - Software versions:
     - Briefcase: 0.3.11
     - Toga: 96881f093
  
  
  </issue>
  <code>
  [start of src/web/setup.py]
  1 #!/usr/bin/env python
  2 import re
  3 
  4 from setuptools import setup
  5 
  6 # Version handline needs to be programatic because
  7 # we can't import toga_web to compute the version;
  8 # and to support versioned subpackage dependencies
  9 with open('src/toga_web/__init__.py', encoding='utf8') as version_file:
  10     version_match = re.search(
  11         r"^__version__ = ['\"]([^'\"]*)['\"]",
  12         version_file.read(),
  13         re.M
  14     )
  15     if version_match:
  16         version = version_match.group(1)
  17     else:
  18         raise RuntimeError("Unable to find version string.")
  19 
  20 setup(
  21     version=version,
  22     install_requires=[
  23         # TODO: Due to https://github.com/pyodide/pyodide/issues/2408, the name
  24         # toga-core is ambigous when on the package hasn't been published to
  25         # PyPI. As a workaround, don't specify the dependency, and manually
  26         # ensure that toga-core is installed.
  27         # 'toga-core==%s' % version,
  28     ],
  29 )
  30
  [end of src/web/setup.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/src/web/setup.py b/src/web/setup.py
  --- a/src/web/setup.py
  +++ b/src/web/setup.py
  @@ -20,10 +20,6 @@
   setup(
       version=version,
       install_requires=[
  -        # TODO: Due to https://github.com/pyodide/pyodide/issues/2408, the name
  -        # toga-core is ambigous when on the package hasn't been published to
  -        # PyPI. As a workaround, don't specify the dependency, and manually
  -        # ensure that toga-core is installed.
  -        # 'toga-core==%s' % version,
  +        'toga-core==%s' % version,
       ],
   )
  
verification_info: {"golden_diff": "diff --git a/src/web/setup.py b/src/web/setup.py\n--- a/src/web/setup.py\n+++ b/src/web/setup.py\n@@ -20,10 +20,6 @@\n setup(\n     version=version,\n     install_requires=[\n-        # TODO: Due to https://github.com/pyodide/pyodide/issues/2408, the name\n-        # toga-core is ambigous when on the package hasn't been published to\n-        # PyPI. As a workaround, don't specify the dependency, and manually\n-        # ensure that toga-core is installed.\n-        # 'toga-core==%s' % version,\n+        'toga-core==%s' % version,\n     ],\n )\n", "issue": "Source installs no longer working\n#1614 made some changes to the packaging of modules to support the release package workflow.\r\n\r\nThe wheels generated from this process appear to work fine; however, source installs don't appear to be working. I've had problems on both macOS and Android.\r\n\r\n**To Reproduce**\r\nSteps to reproduce the behavior:\r\n1. `briefcase run` or `briefcase run android` on Tutorial 0.\r\n\r\n**Expected behavior**\r\n\r\nApp should start.\r\n\r\n**Environment:**\r\n - Operating System: macOS\r\n - Python version: 3.10\r\n - Software versions:\r\n   - Briefcase: 0.3.11\r\n   - Toga: 96881f093\r\n\n", "before_files": [{"content": "#!/usr/bin/env python\nimport re\n\nfrom setuptools import setup\n\n# Version handline needs to be programatic because\n# we can't import toga_web to compute the version;\n# and to support versioned subpackage dependencies\nwith open('src/toga_web/__init__.py', encoding='utf8') as version_file:\n    version_match = re.search(\n        r\"^__version__ = ['\\\"]([^'\\\"]*)['\\\"]\",\n        version_file.read(),\n        re.M\n    )\n    if version_match:\n        version = version_match.group(1)\n    else:\n        raise RuntimeError(\"Unable to find version string.\")\n\nsetup(\n    version=version,\n    install_requires=[\n        # TODO: Due to https://github.com/pyodide/pyodide/issues/2408, the name\n        # toga-core is ambigous when on the package hasn't been published to\n        # PyPI. As a workaround, don't specify the dependency, and manually\n        # ensure that toga-core is installed.\n        # 'toga-core==%s' % version,\n    ],\n)\n", "path": "src/web/setup.py"}]}