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Rollup merge of rust-lang#44745 - alexcrichton:no-delim-none, r=estebank
rustc: Don't use DelimToken::None if possible
This commit fixes a regression from rust-lang#44601 where lowering attribute to HIR now
involves expanding interpolated tokens to their actual tokens. In that commit
all interpolated tokens were surrounded with a `DelimToken::None` group of
tokens, but this ended up causing regressions like rust-lang#44730 where the various
attribute parsers in `syntax/attr.rs` weren't ready to cope with
`DelimToken::None`. Instead of fixing the parser in `attr.rs` this commit
instead opts to just avoid the `DelimToken::None` in the first place, ensuring
that the token stream should look the same as it did before where possible.
Closesrust-lang#44730
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