[R6RS] exception vote list
Michael Sperber
sperber at informatik.uni-tuebingen.de
Wed May 10 09:07:04 EDT 2006
Thanks for the hard work on this, Will!
Issues:
- I suggest augmenting the hierarchy as follows:
&domain
&values
for conditions signifying that there was an arity mismatch in a call
to `values' between the call and its continuation. (The placement
is questionable---maybe it should move one level up.)
- I suggest augmenting the hierarchy as follows
&condition
&eval
for conditions raised by code evaluated by `eval'. The condition
type has a field `condition' which contains the real condition.
Moreover, I suggest specifying `eval' such that any exceptions the
code being evaluated raises become &eval conditions, with the `real'
condition couched inside.
- I suggest augmenting the hierarchy as follows
&type
&promise
&exact-integer
&scalar-value
with the obvious meanings. (See below.)
- I suggest augmenting the hierarchy as follows:
&implementation-restrictiuon
&string-size
&vector-size
with the obvious meanings (See below.)
- I suggest renaming the first condition type named `&index' (there
are two) to `&non-negative-exact-integer'.
- I suggest augmenting the condition hierarchy as follows:
&domain
&eval-environment
&eval-definition
with the obvious meanings (See below.)
- I'd like to offer the condition hierarchy in SRFI 79 as an
alternative to the one presented here. (It's really an
elaboration.) Moreover, I'd like to defer the discussion of the
I/O-related conditions to the discussion on I/O. Therefore, I've
voted "discuss later" in those instances.
- I'm assuming this discussion is only about safe mode for the time
being: the terminology review mentions the term only for "must raise
an exception."
- A lot of questions ask for the behavior when an argument is not a
proper list. I've mostly voted "should [1]" here, meaning:
* must raise an exception if any of the pairs representing the list
contains something other than the empty list or a pair
* should raise an exception if the list contains a cycle
1. If an implementation is unable to perform an action or
return a value in a way compatible with the R6RS, then
it (must/should/may/might/returns/abstain/discuss).
Vote: must
1a. If an exception is raised, it must be raised with a
condition of some type, e.g. &implementation-restriction.
If you prefer a different condition, please specify.
Specific condition:
2. If a procedure is passed an argument that is not of the
type specified by the R6RS, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
2a. If an exception is raised, it must be raised with a
condition of some type, e.g. &type.
If you prefer a different condition, please specify.
Specific condition:
3. If a side-effecting procedure (e.g. set-car!, set-cdr!,
vector-set!, string-set!) is passed an immutable object,
such as the value of a literal constant or the string
returned by symbol->string, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
3a. If an exception is raised, it must be raised with a
condition of some type, e.g. &immutable.
If you prefer a different condition, please specify.
Specific condition:
4. If a definition or expression is not syntactically
correct (e.g. (if x y z w) or (lambda (x x) x)),
then it (must/should/may/might/returns/abstain/discuss).
Vote: must
4a. If an exception is raised, it must be raised with a
condition of some type, e.g. &syntax.
If you prefer a different condition, please specify.
Specific condition:
5. If a definition or expression refers to a variable
that is not bound within the library in which the
definition or expression appears, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
5a. If an exception is raised, it must be raised with a
condition of some type, e.g. &undefined.
If you prefer a different condition, please specify.
Specific condition:
6. If evaluation of a letrec or letrec* or an equivalent
sequence of internal definitions results violates the
letrec or letrec* condition, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
6a. If an exception is raised, it must be raised with a
condition of some type, e.g. &undefined.
If you prefer a different condition, please specify.
Specific condition:
7. If an assignment (set!) is executed, and the left
hand side of the assignment is not defined in the
library that contains the assignment, or has not
yet been defined, then it
(must/should/may/might/returns/abstain/discuss).
Vote: discuss [really "must" but I'm unsure what "not yet"
means]
7a. If an exception is raised, it must be raised with a
condition of some type, e.g. &undefined.
If you prefer a different condition, please specify.
Specific condition:
8. If an assignment (set!) is executed, and the left
hand side of the assignment is immutable because
it was imported, or is defined in some environment
whose exported variables are immutable, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
8a. If an exception is raised, it must be raised with a
condition of some type, e.g. &immutable.
If you prefer a different condition, please specify.
Specific condition:
9. If no possible result of the number->string procedure
would satisfy its specification, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
9a. If an exception is raised, it must be raised with a
condition of some type, e.g. &result.
If you prefer a different condition, please specify.
Specific condition:
10. If the result of some arithmetic procedure is specified
to be an infinity that the implementation is unable to
represent, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
10a. If an exception is raised, it must be raised with a
condition of some type, e.g. &no-infinities.
If you prefer a different condition, please specify.
Specific condition:
11. If the result of some arithmetic procedure is specified
to be a NaN that the implementation is unable to
represent, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
11a. If an exception is raised, it must be raised with a
condition of some type, e.g. &no-nans.
If you prefer a different condition, please specify.
Specific condition:
12. If the empty list is passed to the car procedure,
then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
12a. If an exception is raised, it must be raised with a
condition of some type, e.g. &pair.
If you prefer a different condition, please specify.
Specific condition:
13. If the empty list is passed to the cdr procedure,
then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
13a. If an exception is raised, it must be raised with a
condition of some type, e.g. &pair.
If you prefer a different condition, please specify.
Specific condition:
14. If the appropriate composition of car and cdr operations
is not defined for the argument of one of the caar through
cddddr procedures, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
14a. If an exception is raised, it must be raised with a
condition of some type, e.g. &domain.
If you prefer a different condition, please specify.
Specific condition:
15. If the argument to the length procedure is not a list
(i.e. a proper list), then it
(must/should/may/might/returns/abstain/discuss).
Vote: should [1]
15a. If an exception is raised, it must be raised with a
condition of some type, e.g. &list.
If you prefer a different condition, please specify.
Specific condition:
16. If an argument to the append procedure is not a list
(i.e. a proper list), and the argument is not the last
argument, then it
(must/should/may/might/returns/abstain/discuss).
Vote: should [1]
16a. If an exception is raised, it must be raised with a
condition of some type, e.g. &list.
If you prefer a different condition, please specify.
Specific condition:
17. If the last argument to the append procedure is not a
list, then it
(must/should/may/might/returns/abstain/discuss).
Vote:may
17a. If an exception is raised, it must be raised with a
condition of some type, e.g. &list.
If you prefer a different condition, please specify.
Specific condition:
18. If the argument to the reverse procedure is not a
list, then it
(must/should/may/might/returns/abstain/discuss).
Vote: should [1]
18a. If an exception is raised, it must be raised with a
condition of some type, e.g. &list.
If you prefer a different condition, please specify.
Specific condition:
19. If some index argument to a procedure that requires
an index (e.g. list-ref, list-tail, vector-ref) is
not a non-negative exact integer, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
19a. If an exception is raised, it must be raised with a
condition of some type, e.g. &index.
If you prefer a different condition, please specify.
Specific condition: &non-negative-exact-integer
20. If the second argument to memq, memv, or member is
not a list (i.e. a proper list), then it
(must/should/may/might/returns/abstain/discuss).
Vote: should [1]
20a. If an exception is raised, it must be raised with a
condition of some type, e.g. &list.
If you prefer a different condition, please specify.
Specific condition:
21. If the second argument to assq, assv, or assoc is
not a list (i.e. a proper list), then it
(must/should/may/might/returns/abstain/discuss).
Vote: should [1]
21a. If an exception is raised, it must be raised with a
condition of some type, e.g. &list.
If you prefer a different condition, please specify.
Specific condition:
22. If some element of the second argument to assq, assv,
or assoc is not a pair, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
22a. If an exception is raised, it must be raised with a
condition of some type, e.g. &alist.
If you prefer a different condition, please specify.
Specific condition:
23. If the argument to integer->char is not a Unicode
scalar value (i.e. is outside the range of Unicode
scalar values, or within the range of surrogates),
then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
23a. If an exception is raised, it must be raised with a
condition of some type, e.g. &domain.
If you prefer a different condition, please specify.
Specific condition: &scalar-value
24. If the first argument to make-string or make-vector
is not a non-negative exact integer, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
24a. If an exception is raised, it must be raised with a
condition of some type, e.g. &domain.
If you prefer a different condition, please specify.
Specific condition: &non-negative-exact-integer
25. If the first argument to make-string or make-vector
is a non-negative exact integer that is larger than
some implementation-specific limit on the size of a
string or vector, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
25a. If an exception is raised, it must be raised with a
condition of some type, e.g. &implementation-restriction.
If you prefer a different condition, please specify.
Specific condition: &string-size, &vector-size
26. If the second argument to string-ref, vector-ref,
string-set!, or vector-set! is not a non-negative
exact integer, or the second or third argument to
substring is not a non-negative exact integer, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
26a. If an exception is raised, it must be raised with a
condition of some type, e.g. &index.
If you prefer a different condition, please specify.
Specific condition: &non-negative-exact-integer
27. If the second argument to string-ref or vector-ref
is a non-negative exact integer that is larger than
the string-length or vector-length of the first
argument, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
27a. If an exception is raised, it must be raised with a
condition of some type, e.g. &domain.
If you prefer a different condition, please specify.
Specific condition: &index
28. If the second or third argument to substring is
a non-negative exact integer that is larger than
the string-length of the first argument, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
28a. If an exception is raised, it must be raised with a
condition of some type, e.g. &domain.
If you prefer a different condition, please specify.
Specific condition: &index
29. If the second argument to substring is larger than
the third, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
29a. If an exception is raised, it must be raised with a
condition of some type, e.g. &incompatible.
If you prefer a different condition, please specify.
Specific condition: &index
30. If the argument to list->string or list->vector is
not a list (i.e. not a proper list), then it
(must/should/may/might/returns/abstain/discuss).
Vote: should [1]
30a. If an exception is raised, it must be raised with a
condition of some type, e.g. &list.
If you prefer a different condition, please specify.
Specific condition:
31. If an element of the argument to list->string is not
a character, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
31a. If an exception is raised, it must be raised with a
condition of some type, e.g. &domain.
If you prefer a different condition, please specify.
Specific condition: &char
32. If the last argument to apply is not a list, then it
(must/should/may/might/returns/abstain/discuss).
Vote: should [1]
32a. If an exception is raised, it must be raised with a
condition of some type, e.g. &list.
If you prefer a different condition, please specify.
Specific condition:
33. If any but the first argument to map or for-each is
not a list (i.e. not a proper list), then it
(must/should/may/might/returns/abstain/discuss).
Vote: should [1]
33a. If an exception is raised, it must be raised with a
condition of some type, e.g. &list.
If you prefer a different condition, please specify.
Specific condition:
34. If the list arguments to map or for-each are not
all of the same length, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
34a. If an exception is raised, it must be raised with a
condition of some type, e.g. &incompatible.
If you prefer a different condition, please specify.
Specific condition:
35. If the argument to force is not a promise created by
delay, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
35a. If an exception is raised, it must be raised with a
condition of some type, e.g. &domain.
If you prefer a different condition, please specify.
Specific condition: &promise
36. If the escape procedure that is created by
call-with-current-continuation is called with zero
arguments or with more than one argument, then it
(must/should/may/might/returns/abstain/discuss).
Vote: discuss
36a. If an exception is raised, it must be raised with a
condition of some type, e.g. &violation.
If you prefer a different condition, please specify.
Specific condition:
37. If zero values or more than one value are returned
to a continuation that requires one value, then it
(must/should/may/might/returns/abstain/discuss).
Vote: should
37a. If an exception is raised, it must be raised with a
condition of some type, e.g. &violation.
If you prefer a different condition, please specify.
Specific condition: &values
38. If an escape procedure is used to escape from the
dynamic context of the before or after thunks passed
to a dynamic-wind, then it
(must/should/may/might/returns/abstain/discuss).
Vote: returns [or rather, does its job according to the semantics]
38a. If an exception is raised, it must be raised with a
condition of some type, e.g. &violation.
If you prefer a different condition, please specify.
Specific condition:
39. If the first argument to eval is not syntactically
correct, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
39a. If an exception is raised, it must be raised with a
condition of some type, e.g. &syntax.
If you prefer a different condition, please specify.
Specific condition:
40. If the second argument to eval is omitted or is not
one of the environments or things that R6RS explicitly
allows as the second argument to eval, then it
(must/should/may/might/returns/abstain/discuss).
Vote: should
40a. If an exception is raised, it must be raised with a
condition of some type, e.g. &domain.
If you prefer a different condition, please specify.
Specific condition: &eval-environment
41. If the first argument to eval is a definition, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
41a. If an exception is raised, it must be raised with a
condition of some type, e.g. &violation.
If you prefer a different condition, please specify.
Specific condition: &eval-definition
42. If the argument to null-environment or scheme-report-environment
is not the exact integer 6, then it
(must/should/may/might/returns/abstain/discuss).
Vote: abstain [I'm assuming these procedures will be dropped]
42a. If an exception is raised, it must be raised with a
condition of some type, e.g. &domain.
If you prefer a different condition, please specify.
Specific condition:
43. If interaction-environment is called, then it
(must/should/may/might/returns/abstain/discuss).
Vote: abstain
43a. If an exception is raised, it must be raised with a
condition of some type, e.g. &nonstandard.
If you prefer a different condition, please specify.
Specific condition:
44. If any i/o procedure detects what would (in most other
languages/libraries) be considered an i/o error, then it
(must/should/may/might/returns/abstain/discuss).
Vote: discuss later
44a. If an exception is raised, it must be raised with a
condition of some type, e.g. &io.
If you prefer a different condition, please specify.
Specific condition:
45. If call-with-input-file or open-input-file is asked
to open a file that doesn't seem to exist, then it
(must/should/may/might/returns/abstain/discuss).
Vote: discuss later
45a. If an exception is raised, it must be raised with a
condition of some type, e.g. &io.
If you prefer a different condition, please specify.
Specific condition:
46. If call-with-output-file or open-output-file is asked
to open a file that seems already to exist, then it
(must/should/may/might/returns/abstain/discuss).
Vote: discuss later
46a. If an exception is raised, it must be raised with a
condition of some type, e.g. &io.
If you prefer a different condition, please specify.
Specific condition:
47. If the string argument to call-with-input-file,
call-with-output-file, open-input-file, or
open-output-file is not a string of the form
that is used to name files on the executing
systems, then it
(must/should/may/might/returns/abstain/discuss).
Vote: discuss later
47a. If an exception is raised, it must be raised with a
condition of some type, e.g. &domain.
If you prefer a different condition, please specify.
Specific condition:
48. If call-with-input-file, call-with-output-file,
open-input-file, or open-output-file is unable
to open a file for any other reason, then it
(must/should/may/might/returns/abstain/discuss).
Vote: discuss later
48a. If an exception is raised, it must be raised with a
condition of some type, e.g. &io.
If you prefer a different condition, please specify.
Specific condition:
49. If read encounters an end-of-file in the middle of
parsing some external representation that is not yet
complete, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
49a. If an exception is raised, it must be raised with a
condition of some type, e.g. &lexical.
If you prefer a different condition, please specify.
Specific condition:
50. If read encounters the external representation of an
infinity (e.g. -inf.0 or +inf.0), and the implementation
is unable to represent the infinity, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
50a. If an exception is raised, it must be raised with a
condition of some type, e.g. &no-infinities.
If you prefer a different condition, please specify.
Specific condition:
51. If read encounters the external representation of an
NaN (e.g. +nan.0), and the implementation is unable to
represent the NaN, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
51a. If an exception is raised, it must be raised with a
condition of some type, e.g. &no-nans.
If you prefer a different condition, please specify.
Specific condition:
52. If read encounters the external representation of any
other number that the implementation is unable to
represent (e.g. a one followed by one million zeros
in a system that is unable to represent such large
numbers), then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
52a. If an exception is raised, it must be raised with a
condition of some type, e.g. &implementation-restriction.
If you prefer a different condition, please specify.
Specific condition:
53. If read encounters an external representation of the
form #!<symbol>, where <symbol> is a valid external
representation of a symbol, then it
(must/should/may/might/returns/abstain/discuss).
Vote: may
53a. If an exception is raised, it must be raised with a
condition of some type, e.g. &lexical.
If you prefer a different condition, please specify.
Specific condition:
54. If read encounters an external representation of the
form #{<datum>*}, where <datum>* is a sequence of
valid external representations, then it
(must/should/may/might/returns/abstain/discuss).
Vote: discuss
54a. If an exception is raised, it must be raised with a
condition of some type, e.g. &lexical.
If you prefer a different condition, please specify.
Specific condition:
55. If read encounters any other nonstandard external
representation, then it
(must/should/may/might/returns/abstain/discuss).
Vote: must
55a. If an exception is raised, it must be raised with a
condition of some type, e.g. &lexical.
If you prefer a different condition, please specify.
Specific condition:
56. If the first argument to write, display, or write-char
cannot be output to its second argument (e.g. the first
argument to write-char is some weird Unicode character,
and the output port accepts only ASCII characters), then it
(must/should/may/might/returns/abstain/discuss).
Vote: discuss later
56a. If an exception is raised, it must be raised with a
condition of some type, e.g. &incompatible.
If you prefer a different condition, please specify.
Specific condition:
--
Cheers =8-} Mike
Friede, Völkerverständigung und überhaupt blabla
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