[R6RS] my notes on today's conference call (22 March 2006)
William D Clinger
will at ccs.neu.edu
Wed Mar 22 13:59:51 EST 2006
Conference call March 22 2006 starting about 12:45pm
all present by 12:49pm:
Kent, Anton, Matthew, Mike, Will
0. finalize agenda (1 minute)
1. action items from 3/15/2006 (5 minutes)
- create and commit consolidated SRFI 34 + modifications (Mike)
done
- look over proposed condition hierarchy and details (All)
- propose core/base/non-base-library split of r5rs and r6rs features (Anton)
done
- read SRFI-83 R6RS library syntax (All)
done
- carried over:
- read byte-vector, I/O SRFIs (Anton, Kent, Matthew, Will)
done
- post note re: van Tonder syntax-case differences (Matthew)
covered via email discussions
- draft syntax-case SRFI (Kent) [by 3/29]
2. character escape syntax within strings (5 minutes)
keep \n, \t, etc
rename newline character to linefeed (its Unicode name)
but keep \n as its syntax within strings
#x<...> vs #x...;
vote: go with #x...;
3. what subset of the symbols are allowed as identifiers (10 minutes)
what is motivation?
to discourage mischief and accidents:
variables and expressions that look the same but aren't
could restrict string->symbol instead
would break 1-1 correspondence between strings and symbols
is that really important?
could revise symbol syntax to eliminate whitespace, parens, etc
use hex escapes for all whitespace, punctuation, weirdness
seems like a good compromise
doesn't break correspondence between strings and symbols
may allow us to flush vertical bar notation for symbols
4. libraries (10-20 minutes)
Will's questions and example
error in Will's library "B", can be fixed however
(1 2 3 1 2 3) is the intended output
when a library is invoked twice, a second copy of its
variables is created
two phases or infinitely many?
affects syntax-rules as well as syntax-case
SRFI 83: depends on how template is used
"Does that make sense?"
"Not much of this makes sense."
SRFI 72's notion of phases is what Matthew had in mind
SRFI 72 is stronger than 83 because it gives access to
multiple phases within a single library (using
nested begin-for-syntax around an import)
Matthew recommended against arbitrary begin-for-syntax
but sees no problem with begin-for-syntax just for
imports, as part of the library syntax
Chez Scheme has meta-syntax, meta-define-syntax, but
it doesn't mean what you think it means (?!)
what about a procedural macro that depends on a procedure?
the procedure would have to be in another library
and be imported for expand
could flush language string and say library6 instead
5. I/O (10-20 minutes)
what does this include?
SRFI 81 (ports) and 79 (primitive io), not SRFI 80 or 82
opening for both reading and writing
buffering (and flushing the output buffer)
closing (you can close one without closing the other)
Using #f vs an eof object to indicate end of file
read needs eof object
read-char is an overlap
convenience vs confusion and backward compatibility
6. core/library split (10 minutes, time permitting)
no time left for this
for next week:
core/library split
syntax
i/o
7. adjourned at 1:45pm
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