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Couldn't make condition-case work

How to condition-case Lisp nesting exceeds `max-lisp-eval-depth'?What is the difference between the error handler in condition-case and the error functionOn Windows 8.1, in Emacs Ghostscript doesn't work, while on commandline it doesHow Can I Prevent make-process from failing if the default-directory doesn't exist?

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1

Hello fellow Emacs Lisp enthusiasts!

I've encountered problem that I am even embarrassed to describe. It is very clear how to use condition-case from all the docs and examples that I can find online, but still even the simplest example won't work for me.

Here is a minimal code snippet:

(defun foo ()

  (signal 'test-signal '(1 2 3)))



(condition-case nil

    (foo)

  (test-signal nil))

I use Emacs 26.1, but encounter the same behaviour on other versions as well.

Thank you for any help!

error-handling

share|improve this question

asked 9 hours ago

Valeriy SavchenkoValeriy Savchenko

10833 bronze badges

New contributor

Valeriy Savchenko is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

1

Hello fellow Emacs Lisp enthusiasts!

I've encountered problem that I am even embarrassed to describe. It is very clear how to use condition-case from all the docs and examples that I can find online, but still even the simplest example won't work for me.

Here is a minimal code snippet:

(defun foo ()

  (signal 'test-signal '(1 2 3)))



(condition-case nil

    (foo)

  (test-signal nil))

I use Emacs 26.1, but encounter the same behaviour on other versions as well.

Thank you for any help!

error-handling

share|improve this question

asked 9 hours ago

Valeriy SavchenkoValeriy Savchenko

10833 bronze badges

New contributor

Valeriy Savchenko is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

Hello fellow Emacs Lisp enthusiasts!

I've encountered problem that I am even embarrassed to describe. It is very clear how to use condition-case from all the docs and examples that I can find online, but still even the simplest example won't work for me.

Here is a minimal code snippet:

(defun foo ()

  (signal 'test-signal '(1 2 3)))



(condition-case nil

    (foo)

  (test-signal nil))

I use Emacs 26.1, but encounter the same behaviour on other versions as well.

Thank you for any help!

error-handling

share|improve this question

asked 9 hours ago

Valeriy SavchenkoValeriy Savchenko

10833 bronze badges

New contributor

Valeriy Savchenko is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

(defun foo ()

  (signal 'test-signal '(1 2 3)))



(condition-case nil

    (foo)

  (test-signal nil))

share|improve this question

asked 9 hours ago

Valeriy SavchenkoValeriy Savchenko

10833 bronze badges

New contributor

Valeriy Savchenko is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 9 hours ago

Valeriy SavchenkoValeriy Savchenko

10833 bronze badges

New contributor

Valeriy Savchenko is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 9 hours ago

Valeriy SavchenkoValeriy Savchenko

10833 bronze badges

New contributor

Valeriy Savchenko is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

asked 9 hours ago

Valeriy SavchenkoValeriy Savchenko

10833 bronze badges

2 Answers
2

active

oldest

votes

2

Your error symbol test-signal is not defined. C-h f signal says:

An error symbol is a symbol with an error-conditions property
that is a list of condition names.

Let's check this for some standard error symbols and the test-signal

(get 'error 'error-conditions)

;; => (error)



(get 'args-out-of-range 'error-conditions)

;; => (args-out-of-range error)



(get 'test-signal 'error-conditions)

;; => nil

To define an error symbol, use define-error, e.g.,

(define-error 'test-signal "My error for testing")

then you can handle the error in condition-case, e.g.,

(condition-case err

    (signal 'test-signal '(1 2 3))

  (test-signal (error-message-string err)))

;; => "My error for testing: 1, 2, 3"

share|improve this answer

answered 8 hours ago

xuchunyangxuchunyang

9,65711 gold badge99 silver badges2727 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks a lot! That was the problem. I was checkin eieio code, but their error (invalid-slot-type ) doesn't seem to be defined like this.
  
  – Valeriy Savchenko
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ValeriySavchenko The invalid-slot-type error symbol is defined with define-error since Emacs 25.1. In early versions, it is defined with put. By the way, define-error is added in Emacs 24.4.
  
  – xuchunyang
  7 hours ago
  
  
  

  
  
  
  

add a comment | 

1

You need to define a symbol as an error to get Emacs to recognize it:

(define-error 'test-signal

  "Test signal" 'error)



(defun foo ()

  (signal 'test-signal '(1 2 3)))



(condition-case nil

    (foo)

  (error nil))

From (elisp) Error Symbols:

-- Function: define-error name message &optional parent

In order for a symbol to be an error symbol, it must be defined
with define-error which takes a parent condition (defaults to
error). This parent defines the conditions that this kind of
error belongs to. The transitive set of parents always includes
the error symbol itself, and the symbol error. Because quitting
is not considered an error, the set of parents of quit is just
(quit).

share|improve this answer

answered 8 hours ago

DoMiNeLa10♦DoMiNeLa10

2,09911 gold badge77 silver badges2424 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks a lot! It helped!
  
  – Valeriy Savchenko
  7 hours ago
  

  
  
  
  

add a comment | 

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2

Your error symbol test-signal is not defined. C-h f signal says:

An error symbol is a symbol with an error-conditions property
that is a list of condition names.

Let's check this for some standard error symbols and the test-signal

(get 'error 'error-conditions)

;; => (error)



(get 'args-out-of-range 'error-conditions)

;; => (args-out-of-range error)



(get 'test-signal 'error-conditions)

;; => nil

To define an error symbol, use define-error, e.g.,

(define-error 'test-signal "My error for testing")

then you can handle the error in condition-case, e.g.,

(condition-case err

    (signal 'test-signal '(1 2 3))

  (test-signal (error-message-string err)))

;; => "My error for testing: 1, 2, 3"

share|improve this answer

answered 8 hours ago

xuchunyangxuchunyang

9,65711 gold badge99 silver badges2727 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks a lot! That was the problem. I was checkin eieio code, but their error (invalid-slot-type ) doesn't seem to be defined like this.
  
  – Valeriy Savchenko
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ValeriySavchenko The invalid-slot-type error symbol is defined with define-error since Emacs 25.1. In early versions, it is defined with put. By the way, define-error is added in Emacs 24.4.
  
  – xuchunyang
  7 hours ago
  
  
  

  
  
  
  

add a comment | 

2

Your error symbol test-signal is not defined. C-h f signal says:

An error symbol is a symbol with an error-conditions property
that is a list of condition names.

Let's check this for some standard error symbols and the test-signal

(get 'error 'error-conditions)

;; => (error)



(get 'args-out-of-range 'error-conditions)

;; => (args-out-of-range error)



(get 'test-signal 'error-conditions)

;; => nil

To define an error symbol, use define-error, e.g.,

(define-error 'test-signal "My error for testing")

then you can handle the error in condition-case, e.g.,

(condition-case err

    (signal 'test-signal '(1 2 3))

  (test-signal (error-message-string err)))

;; => "My error for testing: 1, 2, 3"

share|improve this answer

answered 8 hours ago

xuchunyangxuchunyang

9,65711 gold badge99 silver badges2727 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks a lot! That was the problem. I was checkin eieio code, but their error (invalid-slot-type ) doesn't seem to be defined like this.
  
  – Valeriy Savchenko
  7 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ValeriySavchenko The invalid-slot-type error symbol is defined with define-error since Emacs 25.1. In early versions, it is defined with put. By the way, define-error is added in Emacs 24.4.
  
  – xuchunyang
  7 hours ago
  
  
  

  
  
  
  

add a comment | 

Your error symbol test-signal is not defined. C-h f signal says:

An error symbol is a symbol with an error-conditions property
that is a list of condition names.

Let's check this for some standard error symbols and the test-signal

(get 'error 'error-conditions)

;; => (error)



(get 'args-out-of-range 'error-conditions)

;; => (args-out-of-range error)



(get 'test-signal 'error-conditions)

;; => nil

To define an error symbol, use define-error, e.g.,

(define-error 'test-signal "My error for testing")

then you can handle the error in condition-case, e.g.,

(condition-case err

    (signal 'test-signal '(1 2 3))

  (test-signal (error-message-string err)))

;; => "My error for testing: 1, 2, 3"

share|improve this answer

answered 8 hours ago

xuchunyangxuchunyang

9,65711 gold badge99 silver badges2727 bronze badges

(get 'error 'error-conditions)

;; => (error)



(get 'args-out-of-range 'error-conditions)

;; => (args-out-of-range error)



(get 'test-signal 'error-conditions)

;; => nil

(define-error 'test-signal "My error for testing")

(condition-case err

    (signal 'test-signal '(1 2 3))

  (test-signal (error-message-string err)))

;; => "My error for testing: 1, 2, 3"

share|improve this answer

answered 8 hours ago

xuchunyangxuchunyang

9,65711 gold badge99 silver badges2727 bronze badges

answered 8 hours ago

xuchunyangxuchunyang

9,65711 gold badge99 silver badges2727 bronze badges

answered 8 hours ago

xuchunyangxuchunyang

9,65711 gold badge99 silver badges2727 bronze badges

1

You need to define a symbol as an error to get Emacs to recognize it:

(define-error 'test-signal

  "Test signal" 'error)



(defun foo ()

  (signal 'test-signal '(1 2 3)))



(condition-case nil

    (foo)

  (error nil))

From (elisp) Error Symbols:

-- Function: define-error name message &optional parent

In order for a symbol to be an error symbol, it must be defined
with define-error which takes a parent condition (defaults to
error). This parent defines the conditions that this kind of
error belongs to. The transitive set of parents always includes
the error symbol itself, and the symbol error. Because quitting
is not considered an error, the set of parents of quit is just
(quit).

share|improve this answer

answered 8 hours ago

DoMiNeLa10♦DoMiNeLa10

2,09911 gold badge77 silver badges2424 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks a lot! It helped!
  
  – Valeriy Savchenko
  7 hours ago
  

  
  
  
  

add a comment | 

1

You need to define a symbol as an error to get Emacs to recognize it:

(define-error 'test-signal

  "Test signal" 'error)



(defun foo ()

  (signal 'test-signal '(1 2 3)))



(condition-case nil

    (foo)

  (error nil))

From (elisp) Error Symbols:

-- Function: define-error name message &optional parent

In order for a symbol to be an error symbol, it must be defined
with define-error which takes a parent condition (defaults to
error). This parent defines the conditions that this kind of
error belongs to. The transitive set of parents always includes
the error symbol itself, and the symbol error. Because quitting
is not considered an error, the set of parents of quit is just
(quit).

share|improve this answer

answered 8 hours ago

DoMiNeLa10♦DoMiNeLa10

2,09911 gold badge77 silver badges2424 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks a lot! It helped!
  
  – Valeriy Savchenko
  7 hours ago
  

  
  
  
  

add a comment | 

You need to define a symbol as an error to get Emacs to recognize it:

(define-error 'test-signal

  "Test signal" 'error)



(defun foo ()

  (signal 'test-signal '(1 2 3)))



(condition-case nil

    (foo)

  (error nil))

From (elisp) Error Symbols:

-- Function: define-error name message &optional parent

In order for a symbol to be an error symbol, it must be defined
with define-error which takes a parent condition (defaults to
error). This parent defines the conditions that this kind of
error belongs to. The transitive set of parents always includes
the error symbol itself, and the symbol error. Because quitting
is not considered an error, the set of parents of quit is just
(quit).

share|improve this answer

answered 8 hours ago

DoMiNeLa10♦DoMiNeLa10

2,09911 gold badge77 silver badges2424 bronze badges

(define-error 'test-signal

  "Test signal" 'error)



(defun foo ()

  (signal 'test-signal '(1 2 3)))



(condition-case nil

    (foo)

  (error nil))

share|improve this answer

answered 8 hours ago

DoMiNeLa10♦DoMiNeLa10

2,09911 gold badge77 silver badges2424 bronze badges

answered 8 hours ago

DoMiNeLa10♦DoMiNeLa10

2,09911 gold badge77 silver badges2424 bronze badges

answered 8 hours ago

DoMiNeLa10♦DoMiNeLa10

2,09911 gold badge77 silver badges2424 bronze badges