Adding a function argument with the same type as the previous one

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1

I use the following insert-mode mapping to add an argument to a (C/C++) function with the same type as the previous argument:

define-command -hidden -override insert-last-arg-type %{
    execute-keys -draft 'Z<a-f>,bh<a-?>[(,]<ret>Ls[^ ].*<ret>yzP'
}

map global insert <a-,> '<a-;>: insert-last-arg-type<ret>'

For example, If I type

void foo(const std::vector<int> &a,

and then press <a-,>, I get:

void foo(const std::vector<int> &a, const std::vector<int> &
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