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// Package userfunc implements a HCL extension that allows user-defined
// functions in HCL configuration.
//
// Using this extension requires some integration effort on the part of the
// calling application, to pass any declared functions into a HCL evaluation
// context after processing.
//
// The function declaration syntax looks like this:
//
// function "foo" {
// params = ["name"]
// result = "Hello, ${name}!"
// }
//
// When a user-defined function is called, the expression given for the "result"
// attribute is evaluated in an isolated evaluation context that defines variables
// named after the given parameter names.
//
// The block name "function" may be overridden by the calling application, if
// that default name conflicts with an existing block or attribute name in
// the application.
package userfunc
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