Hi All,

I’m working on SR-3423, the issue basically is Swift does not allow using 
literals when they are represented as tuples. Now when I went through the 
codebase, I found that (AFAIK) it can be fixed by either
a) giving tuples of literals a LiteralExpr, so there will be something like 
TupleLiteralExpr when they hold literal values.
Or b) changing the condition “The raw value must be syntactically a simple 
literal” which stated in lib/Parse/ParseDecl.cpp::5223 to comprise a case where 
the raw value is tuples of literal.
I think that the second case (b) is more specific about the issue, but will it 
have downsides in the future?
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