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Add mangling for pack indexing types and expressions (C++26)#198

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cor3ntin wants to merge 1 commit intoitanium-cxx-abi:mainfrom
cor3ntin:pack_indexing
Open

Add mangling for pack indexing types and expressions (C++26)#198
cor3ntin wants to merge 1 commit intoitanium-cxx-abi:mainfrom
cor3ntin:pack_indexing

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@cor3ntin
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This proposes

<type> ::= Dy <type> <index expression>                   # pack indexing type
<expression> ::= sy <template-param> <index expression>   # pack indexing expression
<expression> ::= sy <function-param> <index expression>   # pack indexing expression

And roughly mirrors sizeof....
The case of a partially substituted pack of type is not handled.

This proposes
```
<type> ::= Dy <type> <index expression>                   # pack indexing type
<expression> ::= sy <template-param> <index expression>   # pack indexing expression
<expression> ::= sy <function-param> <index expression>   # pack indexing expression
```

And roughly mirrors `sizeof...`.
The case of a partially substituted pack of type is not handled.
@cor3ntin
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Related issue #175

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