[SQL] "copy from" in "create function"

[Gifford Hesketh]

Am I forgetting some limitation ?  I get "ERROR:  syntax error at or
near "$1" at character 22" with this:

CREATE FUNCTION public.fn_b_import( text ) RETURNS void AS 
'
COPY b_import FROM $1 ;
'
LANGUAGE 'sql' STABLE;

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