Fix world age for show methods in doctests

Fixes JuliaDocs#398.

src/DocChecks.jl

@@ -271,7 +271,7 @@ end
 
 function result_to_string(buf, value)
     dis = text_display(buf)
-    value === nothing || display(dis, value)
+    value === nothing || eval(Expr(:call, display, dis, QuoteNode(value)))
     sanitise(buf)
 end
 

test/examples/make.jl

@@ -79,6 +79,25 @@ module AutoDocs
     end
 end
 
+module Issue398
+
+immutable TestType{T} end
+
+function _show end
+Base.show(io::IO, t::TestType) = _show(io, t)
+
+macro define_show_and_make_object(x, y)
+    z = Expr(:quote, x)
+    esc(quote
+        $(Issue398)._show(io::IO, t::$(Issue398).TestType{$z}) = print(io, $y)
+        const $x = $(Issue398).TestType{$z}()
+    end)
+end
+
+export @define_show_and_make_object
+
+end # module
+
 # Build example docs
 using Documenter
 
@@ -89,6 +108,7 @@ examples_markdown_doc = makedocs(
     debug = true,
     root  = examples_root,
     build = "builds/markdown",
+    doctest = false,
 )
 
 info("Building mock package docs: HTMLWriter")

test/examples/src/index.md

@@ -136,3 +136,16 @@ julia> fullname(Base.Pkg)
 julia> current_module()
 Main
 ```
+
+# Issue398
+
+```@meta
+DocTestSetup = quote
+    using Issue398
+end
+```
+
+```jldoctest
+julia> @define_show_and_make_object q "abcd"
+abcd
+```