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More help for users when encountering UndefVarError #17062

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ivarne opened this issue Jun 22, 2016 · 3 comments · Fixed by #51979
Closed
3 tasks

More help for users when encountering UndefVarError #17062

ivarne opened this issue Jun 22, 2016 · 3 comments · Fixed by #51979
Labels
error handling Handling of exceptions by Julia or the user good first issue Indicates a good issue for first-time contributors to Julia Hacktoberfest Good for Hacktoberfest participants help wanted Indicates that a maintainer wants help on an issue or pull request

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@ivarne
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ivarne commented Jun 22, 2016

The printing of UndefVarError is very minimalistic and can be improved to look for common mistakes.

  • Look for variable names that is similar to Base functions/types (eg, levenshtein distance/length)
  • Collect a list of function names in other languages and add explanation of how to get equivalent results in Julia
  • Collect a list of function names in common packages so that we can point users to the correct package (especially relevant now that we have started to move functions out of Base).

I opened the similar issue #7512 a while ago, but it was hard to find a general solution.

Ref #17046 (comment), and cc @tknopp
@ivarne ivarne added help wanted Indicates that a maintainer wants help on an issue or pull request error handling Handling of exceptions by Julia or the user good first issue Indicates a good issue for first-time contributors to Julia labels Jun 22, 2016
@oxinabox
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Is there levenshtein distance already in Base?
(I know it is in Distences.jl)
But I'm not sure what is used for apropos.

@MichaelHatherly
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Is there levenshtein distance already in Base?

Yup, there's one here.

@dbeach24
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Finding similar function names (based on levens
Is there a good way to get the names of the local variables within the stack frame that triggered the UndefVarError?

@kshyatt kshyatt added the Hacktoberfest Good for Hacktoberfest participants label Oct 5, 2016
This was referenced Apr 5, 2018
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@vtjnash vtjnash mentioned this issue Mar 16, 2020
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@mkitti mkitti mentioned this issue Aug 2, 2021
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vtjnash added a commit that referenced this issue Oct 31, 2023
@vtjnash
add verbose UndefVarError messages
434809b 
Record the 'scope' of the variable that was undefined (the Module, or a
descriptive word such as :local or :static_parameter). Add that scope to
the error message, and expand the hint suggestions added by the REPL to
include more specific advice on common mistakes:

  - forgetting to set an initial value
  - forgetting to import a global
  - creating a local of the same name as a global
  - not matching a static parameter in a signature subtype

Fixes #17062 (although more could probably be done to search for typos using REPL.string_distance and getting the method from stacktrace)
Fixes #18877
Fixes #25263
Fixes #35126
Fixes #39280
Fixes #41728
Fixes #48731
Fixes #49917
Fixes #50369
@vtjnash vtjnash mentioned this issue Nov 1, 2023
Merged
vtjnash added a commit that referenced this issue Nov 8, 2023
@vtjnash
add verbose UndefVarError messages
b985793 
Record the 'scope' of the variable that was undefined (the Module, or a
descriptive word such as :local or :static_parameter). Add that scope to
the error message, and expand the hint suggestions added by the REPL to
include more specific advice on common mistakes:

  - forgetting to set an initial value
  - forgetting to import a global
  - creating a local of the same name as a global
  - not matching a static parameter in a signature subtype

Fixes #17062 (although more could probably be done to search for typos using REPL.string_distance and getting the method from stacktrace)
Fixes #18877
Fixes #25263
Fixes #35126
Fixes #39280
Fixes #41728
Fixes #48731
Fixes #49917
Fixes #50369
vtjnash added a commit that referenced this issue Nov 8, 2023
@vtjnash
make UndefVarError messages more precise and informative (#51979)
449c7a2 
Record the 'scope' of the variable that was undefined (the Module, or a
descriptive word such as :local or :static_parameter). Add that scope to
the error message, and expand the hint suggestions added by the REPL to
include more specific advice on common mistakes:

  - forgetting to set an initial value
  - forgetting to import a global
  - creating a local of the same name as a global
  - not matching a static parameter in a signature subtype

Fixes #17062 (although more could probably be done to search for typos
using REPL.string_distance and getting the method from stacktrace)
Fixes #18877
Fixes #25263
Fixes #35126
Fixes #39280
Fixes #41728
Fixes #48731
Fixes #49917
Fixes #50369
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RFC: make UndefVarError messages more precise and informative JuliaLang/julia
5 participants
@ivarne @kshyatt @oxinabox @MichaelHatherly @dbeach24