String interpolation doc should mention show

[cstjean]

The docs say "Both concatenation and string interpolation call string() to convert objects into string form." but unless I'm mistaken, that's not true:

julia> immutable Blag end

julia> Base.string(::Blag) = "hoy"

julia> "jo $(Blag())"
"jo Blag()"

AFAICT the proper way to get custom printing is to overload show. If that's correct, I can make a PR.

[yuyichao]

The doc is correct.

julia> struct Blag end

julia> Base.string(a::String, b::Blag) = "hoy"

julia> "jo $(Blag())"
"hoy"

It can certainly be clarified if you find it confusing.

[yuyichao]

Link updated, doc issue still applies.