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more notes on exn conversion

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svn: r1186
This commit is contained in:
Matthew Flatt 2005-10-31 17:24:20 +00:00
parent a85f0c76c8
commit 4148dc0764
1 changed files with 12 additions and 9 deletions
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21
notes/mzscheme/MzScheme_300.txt
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@ -499,8 +499,12 @@ at nearly the top level of the hierarchy. In particular, most
instead of the old (and now removed) `not-break-exn?' predicate.
The "type" and "mismatch" exceptions have been merged into
`exn:fail:contract'. Similarly, `exn:i/o:tcp' and `exn:i/o:udp'
have been merged into `exn:fail:network'.
`exn:fail:contract'. Similarly, `exn:i/o:tcp' and `exn:i/o:udp' have
been merged into `exn:fail:network', `exn:i/o:filesystem' has moved to
`exn:fail:filesystem', and other `exn:i/o' exceptions have been
simplified to just `exn:fail'. The `exn:read' and `exn:syntax'
hierarchies moved to `exn:fail:read' and `exn:fail:syntax'. Most other
exceptions merged with `exn:fail:contract' or simply `exn:fail'.
Many exception fields have been eliminated, but certain exceptions
contain multiple source locations instead of just one. Instead of a
@ -509,8 +513,8 @@ single type for all exceptions with source locations, the
information.
Field guards are triggered when an exception record is created, and it
checks the "type" of the field arguments. Mutators are not exported
for exception fields.
checks the "type" of the field arguments. Mutators are not exported
for exception fields.
Structs:
@ -533,18 +537,17 @@ Structs:
exn:fail:unsupported
exn:break - continuation
special-comment - width
; Note: not exn:special-comment, because it doesn't need
; a message or marks
Properties:
exn:srclocs - accessor
exn:srclocs - accessor
======================================================================
Inside MzScheme (extend MzScheme via C)
======================================================================
[See "PLT Foreign Interface Manual" for a new alternative to extending
MzScheme with C code.]
A structure that represents a Scheme type should now start with a
Scheme_Object, instead of Scheme_Type. A Scheme_Object contains only a
Scheme_Type (except in 3m mode), so it takes the same amount of space