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A.5   Quotation sig_item

Syntax tree nodes for language signature items, of type Ast.sig_item. The basic nodes are:
<:sig_item< declare $list:sil$ end >>: declare.
<:sig_item< exception $s$ of $list:tl$ >>: exception declaration.
<:sig_item< external $s$ : $t$ = $list:sl$ >>: declaration of external.
<:sig_item< module $s$ : $mt$ >>: module declaration.
<:sig_item< module type $s$ = $mt$ >>: module type declaration.
<:sig_item< open $sl$ >>: open.
<:sig_item< type $list:sslt$ >>: type declaration.
<:sig_item< value $s$ : $t$ >>: variable declaration.

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