with -> case -> if

[novaugust]

found this rewrite while testing main against a production codebase

-    with account <- Map.put(foo, :bar, true),
-         true <- bop? do
-      {:ok, []}
-    else
+    account = Map.put(foo, :bar, true)
+
+    case bop? do
+      true -> {:ok, []}
       _ -> {:error, :forbidden}
     end

a second rewrite would change that case to an if, so that needs to happen automatically

assert_style """
with foo <- bar,
  true <- bop do
  :ok
else
  _ -> :error
end
""",
"""
foo = bar

if bop do
  :ok
else
  :error
end
"""