David Neto f63a2948c6 Better document ast::Variable parameters
In particular, "is_const=true" is required for formal parameters.

Change-Id: I05105da901a02d9bb51c88cab7430dd211c7b0ea
Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/49302
Commit-Queue: David Neto <dneto@google.com>
Commit-Queue: Ben Clayton <bclayton@google.com>
Auto-Submit: David Neto <dneto@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
2021-04-27 15:16:06 +00:00
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