Merge pull request #9452 from JuliaLang/teh/val

Add wrapper for passing constants through type inference

Author: timholy

base/base.jl

@@ -117,6 +117,10 @@ type DimensionMismatch <: Exception
 end
 DimensionMismatch() = DimensionMismatch("")
 
+# For passing constants through type inference
+immutable Val{T}
+end
+
 type WeakRef
     value
     WeakRef() = WeakRef(nothing)

base/exports.jl

@@ -113,6 +113,7 @@ export
     UnitRange,
     UTF16String,
     UTF32String,
+    Val,
     VecOrMat,
     Vector,
     VersionNumber,