Fix scoping issue

Author: ScottPJones

.travis.yml

@@ -17,6 +17,7 @@ git:
 ## (tests will run but not make your overall status red)
 matrix:
   allow_failures:
+   - julia: 1.0
    - julia: nightly
 
 ## uncomment and modify the following lines to manually install system packages

src/encode.jl

@@ -59,12 +59,7 @@ function _str(str::T) where {T<:Union{Vector{UInt8}, Str{<:Binary_CSEs}, String}
     (siz = sizeof(str)) == 0 && return empty_ascii
     @preserve str begin
         pnt = pointer(str)
-        try
-            len, flags, num4byte, num3byte, num2byte, latin1byte = fast_check_string(pnt, siz)
-        catch ex
-            println("fast_check_string($str) failed:", sprint(showerror, ex, catch_backtrace()))
-            rethrow(ex)
-        end
+        len, flags, num4byte, num3byte, num2byte, latin1byte = fast_check_string(pnt, siz)
         if flags == 0
             buf, out = _allocate(UInt8, len)
             _memcpy(out, pnt, len)