Add method Ok() = Ok(nothing) (#42)

src/core.jl

@@ -1,3 +1,4 @@
+Try.Ok() = Try.Ok(nothing)
 Try.Ok(::Type{T}) where {T} = Try.Ok{Type{T}}(T)
 
 Try.Err(value) = Try.Err(value, maybe_backtrace())

src/docs/Ok.md

@@ -1,5 +1,6 @@
     Ok(value::T) -> ok::Ok{T}
     Ok{T}(value) -> ok::Ok{T}
+    Ok() -> Ok(nothing)
 
 Indicate that `value` is a "success" in a sense defined by the API returning this value.
 

test/TryTests/src/TryTests.jl

@@ -1,5 +1,6 @@
 module TryTests
 
+include("test_core.jl")
 include("test_base.jl")
 include("test_errortrace.jl")
 include("test_tools.jl")

test/TryTests/src/test_core.jl

@@ -0,0 +1,10 @@
+module TestCore
+
+using Test
+using Try
+
+function test_ok_nothing()
+    @test Ok() === Ok(nothing)::Ok{Nothing}
+end
+
+end  # module