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Functions
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.. crowbar:element:: FunctionDeclaration <- FunctionSignature ';'
A function declaration defines the return type, name, and arguments of a function without specifying its behavior.
It is generally used as part of an API boundary.
.. crowbar:element:: FunctionDefinition <- FunctionSignature Block
A function definition provides the actual behavior of a function, which may have been declared previously or may not.
.. todo::
define function linkage/exportedness
.. crowbar:element:: FunctionSignature <- Type identifier '(' SignatureArguments? ')'
SignatureArguments <- Type identifier (',' Type identifier)* ','?
A function signature specifies the return type, name, and arguments of a function.
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