Capture and print error as it appears in the repl · helpdesk (published)

Stream: helpdesk (published)

Topic: Capture and print error as it appears in the repl

Mason Protter (Apr 25 2021 at 22:36):

In the repl, if I do 1 + "hi" I get the error message

julia> 1 + "hi"
ERROR: MethodError: no method matching +(::Int64, ::String)
Closest candidates are:
  +(::Any, ::Any, ::Any, ::Any...) at operators.jl:560
  +(::T, ::T) where T<:Union{Int128, Int16, Int32, Int64, Int8, UInt128, UInt16, UInt32, UInt64, UInt8} at int.jl:87
  +(::Union{Int16, Int32, Int64, Int8}, ::BigInt) at gmp.jl:534
  ...
Stacktrace:
 [1] top-level scope
   @ REPL[15]:1

If I were to wrap this in a try block, what would I have to print to stdout to make all the same info appear? I want to print the error message, the closest candidates info, and the stacktrace the way they appear in the REPL.

Mason Protter (Apr 25 2021 at 22:37):

e.g. I want to know the f such that

try
    1 + "hi"
catch e;
    f(e)
end

will print

ERROR: MethodError: no method matching +(::Int64, ::String)
Closest candidates are:
  +(::Any, ::Any, ::Any, ::Any...) at operators.jl:560
  +(::T, ::T) where T<:Union{Int128, Int16, Int32, Int64, Int8, UInt128, UInt16, UInt32, UInt64, UInt8} at int.jl:87
  +(::Union{Int16, Int32, Int64, Int8}, ::BigInt) at gmp.jl:534
  ...
Stacktrace:
 [1] top-level scope
   @ REPL[15]:1

Kirill Simonov (Apr 25 2021 at 23:01):

Base.display_error(e, catch_backtrace()) seems to work for me.

Mason Protter (Apr 25 2021 at 23:12):

Awesome, thanks! I knew there was something like this floating around

Takafumi Arakaki (tkf) (Apr 25 2021 at 23:16):

If you want a public API to do something similar:

try
    1 + "hi"
catch e;
    @error "got an error" exception = (e, catch_backtrace())
end

Mosè Giordano (Apr 26 2021 at 01:14):

https://stackoverflow.com/a/59690947/2442087

Mason Protter (Apr 26 2021 at 01:31):

Great, thank you both

Fredrik Ekre (Apr 26 2021 at 20:12):

Last updated: Oct 02 2023 at 04:34 UTC