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With the focus on functions in recent hcl releases, I thought it time to introduce the ability to inspect which functions are required to evaluate expressions. This mirrors the Variable traversal present throughout the codebase.
This allows for better error messages and optimizations to be built around supplying custom functions by consumers of HCL.
These changes are backwards compatible and is not a breaking change. I explicitly introduced hcl.ExpressionWithFunctions to allow consumers to opt-into supporting function inspection. I would recommend that this be moved into hcl.Expression if a major version with API changes is ever considered.