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Specify the grammar formulations for attributes #65

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This does not exhaustively express all the places C++ attributes are valid, but it should cover enough detail to be useful.

Fixes #63.

This does not exhaustively express all the places C++ attributes are
valid, but it should cover enough detail to be useful.

Fixes microsoft#63.
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Looks good. I have some minor editing notes that you can take or leave as you please.

all shared grammar elements between HLSL and C++. This spec attempts to detail
some of the grammar and parsing implications and will specify the process by
which existing attributes will convert to C++ attributes.
### Attribute Parsing
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Best to add a blank line before the section header for the benefit of those reading the markdown directly (I don't think it makes a difference in the rendered doc)

which existing attributes will convert to C++ attributes.
### Attribute Parsing

This proposal introduces new grammar formulations for parsing attributes
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I'd probably drop the word "new" - "introduces grammar formulations" is clear

```

In contrast to existing HLSL annotations and Microsoft-style attributes, these
attribute identifiers are case-sensitive `identifier` tokens.
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This is probably clear enough from context and I'm just being pedantic, but "attribute identifiers are case-sensitive identifier tokens" isn't strictly true (there's also the attribute-scoped-token formulation).

Maybe:

In contrast to existing HLSL annotations and Microsoft-style attributes, these formulations use case-sensitive identifier tokens

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[0002] Specify attribute parsing grammar
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