Weird error after defining Base.show method for custom DataType

pfitzseb · June 30, 2022, 11:04am

Yes. ~~Can’t find the issue atm, but, as you can see, doing that can be pretty dangerous.~~

Segfault when defining show for types

opened 12:47PM - 14 Jun 17 UTC

closed 06:16AM - 16 Mar 21 UTC

Here's the minimum repro ```julia _ _ _(_)_ | A fresh approach t…o technical computing (_) | (_) (_) | Documentation: https://docs.julialang.org _ _ _| |_ __ _ | Type "?help" for help. | | | | | | |/ _` | | | | |_| | | | (_| | | Version 0.7.0-DEV.511 (2017-06-08 21:22 UTC) _/ |\__'_|_|_|\__'_| | (HEAD detached at origin/jb/namedtuples)/e2c2724982* (fork: 6 commits, 5 days) |__/ | x86_64-apple-darwin16.6.0 julia> struct Null end julia> Base.show(io::IO, ::Type{Union{T, Null}}) where {T} = print(io, "?$T") julia> struct WeakRefString{T} <: AbstractString ptr::Ptr{T} len::Int # of code units ind::Int # used to keep track of a string data index end julia> Base.show(io::IO, ::Type{WeakRefString{T}}) where {T} = print(io, "WeakRefString{$T}") julia> temp = [] Segmentation fault: 11 jq-mbp:julia jacobquinn$ ``` Note the last thing that happens is it's trying to display `0-element Array{Any,1}`.

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Weird error after defining Base.show method for custom DataType

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