Fixed in 1.0.1

Issues addressed by following patches are already fixed in IronPython 1.0.1. You are advised to upgrade.

patch-ironpython-array-typed-slicing: This patch fixes an issue that slicing a typed array sometimes loses the type information.
patch-ironpython-co-flags: This patch fixes an issue that co_flags reports **-argument only function to have *-argument as well.
patch-ironpython-codedom-empty-return: This patch fixes an issue that CodeDom generator doesn't handle empty return statements.
patch-ironpython-codepage-encoding: This patch fixes an issue that encodings are not registered by their Microsoft Windows codepage number.
patch-ironpython-datetime-subtract: This patch implements subtracting datetime from datetime to produce timedelta.
patch-ironpython-empty-apply: This patch fixes an issue that apply builtin function doesn't accept a single argument.
patch-ironpython-oldstyle-setattr: This patch fixes an issue that __setattr__ isn't called for old-style classes.
patch-ironpython-os-utime: This patch fixes an issue that os.utime doesn't set modified time and set access time wrong.
patch-ironpython-re-backslash-escape: This patch fixes an issue that backslash escape \\ isn't properly handled in regular expression.
patch-ironpython-struct-pad-bytes: This patch fixes an issue that repeated pad bytes are handled as a single pad byte.
patch-ironpython-unknown-code-encoding: This patch lets IronPython to give a better error message in case the declared source code encoding cannot be found.