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my variable %s masks earlier declaration in same scope

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"my" variable %s masks earlier declaration in same scope

(S) A lexical variable has been redeclared in the same scope, effectively eliminating all access to the previous instance. This is almost always a typographical error. Note that the earlier variable will still exist until the end of the scope or until all closure referents to it are destroyed.

Source: what's new for perl5.004
Copyright: Larry Wall, et al.

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