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`expect_block()` takes a start and end token, along with a function to parse a lexical block body. This reduces code, keeps error messages consistent, and also gives us a future place to try resynchronising the parser so we can have more than one error emitted. `expect_paren_block()` and `expect_brace_block()` are convenience helpers for providing the start and end tokens for common block types. Bug: tint:282 Change-Id: I432a0301727b131a6fce875687b952dfc6889a4b Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/31736 Commit-Queue: Ben Clayton <bclayton@google.com> Reviewed-by: dan sinclair <dsinclair@chromium.org>