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with import <nixpkgs> {};
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let
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func = x: y: assert (x==2) || abort "x has to be 2 or it won't work!"; x + y;
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n = -1; # only modify this line
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in
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assert (lib.isInt n) || abort "Type error since supplied argument is no int!";
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rec {
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ex00 = func (n+3) 3;
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} |