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Document filterwarnings(..., append=<bool>).
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‎Doc/lib/libwarnings.tex‎

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@@ -178,8 +178,10 @@ \subsection{Available Functions \label{warning-functions}}
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\begin{funcdesc}{filterwarnings}{action\optional{,
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message\optional{, category\optional{,
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module\optional{, lineno}}}}}
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Insert an entry into the list of warnings filters (at the front).
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module\optional{, lineno\optional{, append}}}}}}
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Insert an entry into the list of warnings filters. The entry is
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inserted at the front by default; if \var{append} is true, it is
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inserted at the end.
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This checks the types of the arguments, compiles the message and
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module regular expressions, and inserts them as a tuple in front
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of the warnings filter. Entries inserted later override entries

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