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Now that we have the necessary functions to deal with this in the low-level HCL API, it's more intuitive to use bare identifiers for these parameter names. This reinforces the idea that they are symbols being defined rather than arbitrary string expressions.
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HCL User Functions Extension
This HCL extension allows a calling application to support user-defined functions.
Functions are defined via a specific block type, like this:
function "add" {
params = [a, b]
result = a + b
}
function "list" {
params = []
variadic_param = items
result = items
}
The extension is implemented as a pre-processor for cty.Body objects. Given
a body that may contain functions, the DecodeUserFunctions function searches
for blocks that define functions and returns a functions map suitable for
inclusion in a hcl.EvalContext. It also returns a new cty.Body that
contains the remainder of the content from the given body, allowing for
further processing of remaining content.
For more information, see the godoc reference.