arityMismatchError but for `fmt` checks since the compiler has not run yet.

Ast formats a Rego AST element.

MustAst is a helper function to format a Rego AST element.

MustAstWithOpts is a helper function to format a Rego AST element.

Source formats a Rego source file.

ArgErrDetail but for `fmt` checks since compiler has not run yet.

Opts lets you control the code formatting via `AstWithOpts()`.