[swift-evolution] [Completing Generics]

[Erik Verbruggen]

> Generic constants
> 
> let constants could be allowed to have generic parameters, such that they produce differently-typed values depending on how they are used. For example, this is particularly useful for named literal values, e.g.,
> 
> let π<T : FloatLiteralConvertible>: T = 3.141592653589793238462643383279502884197169399
> 
> The Clang importer could make particularly good use of this when importing macros.

I assume the following will fall under "constant expression":

	let 2π = 2 * π

Also, how does the clang-importer handle:

	#define M_DOUBLE_PI (2 * M_PI)

Or rephrasing, this is specifically for the case where the initialiser only consists of a single literal token?

-- Erik.
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