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Further NEWS tweaks

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* NEWS: Clarify wording.
This commit is contained in:
Andy Wingo 2019-08-25 21:16:50 +02:00
parent 5284b9b9c6
commit d2bf01b0c9
1 changed files with 14 additions and 11 deletions
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25
NEWS
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@ -28,21 +28,24 @@ and similar.
** Interleaved internal definitions and expressions allowed
It used to be that internal definitions had to precede all expressions
in their bodies; this restriction was relaxed in Guile 3.0. If an
expression precedes an internal definition, it is treated as if it were
a definition of an unreferenced variable. This improves the readability
of Guile programs, as it used to be that program indentation tended to
increase needlessly to allow nested `let' and `letrec' to re-establish
definition contexts after initial expressions, for example for
type-checks on procedure arguments.
in their bodies. This restriction has been relaxed. If an expression
precedes an internal definition, it is treated as if it were a
definition of an unreferenced variable. For example, the expression
`(foo)' transforms to the equivalent of `(define _ (begin (foo) #f))',
if it precedes other definitions.
This change improves the readability of Guile programs, as it used to be
that program indentation tended to increase needlessly to allow nested
`let' and `letrec' to re-establish definition contexts after initial
expressions, for example for type-checks on procedure arguments.
** Optimization of top-level bindings within a compilation unit
At optimization level 2 and above, Guile's compiler is now allowed to
inline definitions within a compilation unit. See "Declarative Modules"
in the manual, for full details. This change can improve the
performance of programs with many small top-level definitions by quite a
bit!
inline top-level definitions within a compilation unit. See
"Declarative Modules" in the manual, for full details. This change can
improve the performance of programs with many small top-level
definitions by quite a bit!