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This is actually allowed by the `rustc` parser but most attributes will
fail later due to attributes on expressions being experimental.
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Array members are allow to have attributes such as `#[cfg]`.
This is a bit tricky as we don't know if the first expression is an
initializer or a member until we encounter a `;`. This reuses a trick
from `stmt` where we remember if we saw an attribute and then raise an
error if the first expression ends up being an initializer.
This isn't perfect as the error isn't correctly located on the attribute
or initializer; it ends up immediately after the `;`.
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Change-Id: I45a856d74fb616d3bce33050f9e69d327186bd59
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1082: Async block in argument position r=matklad a=andreytkachenko
Fixes case when async block appears in argument position
Co-authored-by: Andrey Tkachenko <[email protected]>
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A top level expression is either
- a expression statement or
- the last expression in a block
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pattern_list comes in two variants, one uses the default PAT_RECOVERY_SET as the
recovery set, while other allows the user to provide a recovery set.
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