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Update NEWS

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* NEWS: Update.
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Andy Wingo 2021-01-07 12:12:00 +01:00
parent 74e69220ea
commit ca025920e5
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NEWS
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@ -1,5 +1,5 @@
Guile NEWS --- history of user-visible changes. Guile NEWS --- history of user-visible changes.
Copyright (C) 1996-2020 Free Software Foundation, Inc. Copyright (C) 1996-2021 Free Software Foundation, Inc.
See the end for copying conditions. See the end for copying conditions.
Please send Guile bug reports to bug-guile@gnu.org. Please send Guile bug reports to bug-guile@gnu.org.
@ -16,6 +16,45 @@ O(1) dispatch time, regardless of the length of the chain. This
optimization is also unlocked in many cases for `match' expressions with optimization is also unlocked in many cases for `match' expressions with
many similar clauses whose first differentiator are constants. many similar clauses whose first differentiator are constants.
** New (ice-9 copy-tree) module
This module includes the `copy-tree' procedure that was previously
implemented in C and present in the default `(guile)' module. See
"Copying" in the manual.
** New warning: use-before-definition
This analysis, enabled at `-W1', issues warnings for programs that use
top-level variables before they are defined.
** New warning: non-idempotent-definition
This analysis, enabled at `-W1', issues warnings for programs that whose
use of a variable is ambiguous. For example, in the program:
(define saved-add +)
(define + error)
The intention would seem to be to "save" the value of the base `+'
procedure, then override it locally. However if this program is ever
loaded twice, then the second time it is loaded, `+' will be taken from
the local binding instead of the import. Users that want this kind of
behavior should either use lexical bindings instead of top-level
bindings, or otherwise rename important clobbered bindings via modules.
* New deprecations
** `copy-tree' in the default environment, and `scm_copy_tree' from C
Import the `(ice-9 copy-tree)' module instead.
** `unbound-variable-analysis`, `macro-use-before-definition-analysis`
These bindings from `(language tree-il analyze)' are replaced by the
use-before-definition analysis, which powers a number of warnings. Use
`make-use-before-definition-analysis', but note that these interfaces
are quite intimate parts of the compiler!
* Incompatible changes * Incompatible changes
** `copy' read-option removed ** `copy' read-option removed