[Rd] g"string"

[ivo welch]

One of the more convenient syntax sugars of perl is the embedding of
variables in strings, aka, `$s="I am $a";`. R has similar functionality
through library glue.  Alas, the library does not have the operator
flexibility to make it possible for glue to introduce a `g"I am {a}"` .
 (One can define g("I am {a}") but that steals more of the function
namespace.) Would be nice sugar for end users to have...

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