Produces back-patch as described in the #22235 and referenced in #22480.
This just contains the compiler implementations and the corresponding unit
tests. Connecting the dots as described in #22480 will be in a follow on
change.
PR Close#22506
Modifies validation syntax to generate back references to ensure
that identifiers are used consistently.
Introduced … to allow validating constant definition and usage.
PR Close#21877
