| errors | Package errors implements functions to manipulate errors. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/open-policy-agent/opa/internal/debug | |
| github.com/open-policy-agent/opa/v1/ast | Package ast declares Rego syntax tree types and also includes a parser and compiler for preparing policies for execution in the policy engine. |
| github.com/open-policy-agent/opa/v1/ast/location | Package location defines locations in Rego source code. |
| github.com/open-policy-agent/opa/v1/ir | Package ir defines an intermediate representation (IR) for Rego. |
| io | Package io provides basic interfaces to I/O primitives. |
| sort | Package sort provides primitives for sorting slices and user-defined collections. |