[issue25522] IDLE: warn if save-as name matches stdlib name

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

Also check if the name is not an identifier and therefore could not be imported.  Example:

>>> exec('import abc--bb')
    import abc--bb
              ^
SyntaxError: invalid syntax

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<https://bugs.python.org/issue25522>
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