Can't pass string to @u_str

[matthewelmer-tamu]

I would like to pass a string to @u_str to create a unit, but it doesn't work:

julia> a = "km"
"km"

julia> @u_str(a)
ERROR: LoadError: MethodError: no method matching parse(::Symbol)

Closest candidates are:
  parse(::AbstractString; filename, raise, depwarn)
   @ Base meta.jl:276
  parse(::AbstractString, ::Integer; filename, greedy, raise, depwarn)
   @ Base meta.jl:236

Stacktrace:
 [1] var"@u_str"(__source__::LineNumberNode, __module__::Module, unit::Any)
   @ Unitful ~/.julia/packages/Unitful/R4J37/src/user.jl:630
in expression starting at REPL[100]:1

I'm parsing a json file which contains values and a string representation of their units, so I can't just pass a string literal.

[matthewelmer-tamu]

Nevermind, I just found the undocumented uparse, which serves my purpose.

julia> a = "km"
"km"

julia> Unitful.uparse(a)
km