julia> immutable Z <: Unsigned
foo
end
julia> Z(12)
Error showing value of type Z:
ERROR: MethodError: no method matching leading_zeros(::Z)
Closest candidates are:
leading_zeros{T<:Union{Int128,Int16,Int32,Int64,Int8,UInt128,UInt16,UInt32,UInt64,UInt8}}(::T<:Union{Int128,Int16,Int32,Int64,Int8,UInt128,UInt16,UInt32,UInt64,UInt8}) at int.jl:150
in hex(::Z, ::Int64, ::Bool) at ./intfuncs.jl:303
in display(::Base.REPL.REPLDisplay{Base.REPL.LineEditREPL}, ::MIME{Symbol(“text/plain”)}, ::Z) at ./REPL.jl:132
in display(::Base.REPL.REPLDisplay{Base.REPL.LineEditREPL}, ::Z) at ./REPL.jl:135
in display(::Z) at ./multimedia.jl:143
in print_response(::Base.Terminals.TTYTerminal, ::Any, ::Void, ::Bool, ::Bool, ::Void) at ./REPL.jl:154
in print_response(::Base.REPL.LineEditREPL, ::Any, ::Void, ::Bool, ::Bool) at ./REPL.jl:139
in (::Base.REPL.##22#23{Bool,Base.REPL.##33#42{Base.REPL.LineEditREPL,Base.REPL.REPLHistoryProvider},Base.REPL.LineEditREPL,Base.LineEdit.Prompt})(::Base.LineEdit.MIState, ::Base.AbstractIOBuffer{Array{UInt8,1}}, ::Bool) at ./REPL.jl:652
in run_interface(::Base.Terminals.TTYTerminal, ::Base.LineEdit.ModalInterface) at ./LineEdit.jl:1579
in run_interface(::Base.Terminals.TTYTerminal, ::Base.LineEdit.ModalInterface) at /Applications/Julia-0.5.app/Contents/Resources/julia/lib/julia/sys.dylib:?
in run_frontend(::Base.REPL.LineEditREPL, ::Base.REPL.REPLBackendRef) at ./REPL.jl:903
in run_repl(::Base.REPL.LineEditREPL, ::Base.##930#931) at ./REPL.jl:188
in _start() at ./client.jl:360
in _start() at /Applications/Julia-0.5.app/Contents/Resources/julia/lib/julia/sys.dylib:?
julia> Base.:==(a::Z,b::Z) = “hello, world”
ERROR: syntax: invalid identifier name “:=”
julia> Base.isequal(a::Z,b::Z) = “hello, world”
julia> Z(12)==Z(13)
false
julia> isequal(Z(12),Z(13))
“hello, world”