A trait may require another of every implementor, with a where clause
in the trait. The section shows a function that asks for one trait and
uses the other, and notes that Ord now requires Eq.
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One type may have an implementation at (List int) and another at
(List string). The section says how the compiler picks one, and that
overlapping implementations and calls at a type it cannot decide are
errors.
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timeout and with-deadline take a Duration, made with milliseconds,
seconds, minutes or hours; within takes one too.
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A number bound by def is read as the number written there would be, so
the guide no longer asks for (: n int), and says when (: n double) is
needed.
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The first program no longer ends in a 0, and the appendix says what the
compiler knows about main. The unit type is spelled void in the
signatures that wrote unit, which is its value, and print-n-times has a
loop clause for its body.
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The Settings section says where a parameterize of a setting works: around
show, not around the code that builds a block. For part of an output it
shows with-fmt*, which binds several settings as parameterize does.
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The guide is written for (std fmt) as it is now: one thing needs no
brackets, several things are a vec, and each is needed only for a
lambda given to a function such as vec-map.
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The guide's framed tables use +, - and |, which every font has, so they
line up in a browser whatever font it draws code in.
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A section in "Writing programs" on (std fmt): what a block and a vec of
blocks are, what goes in the brackets and how to convert the rest,
blocks from data, padding, numbers, paragraphs, tables, settings, and
what to write when it does not compile. The std/fmt entry in Part III
gives the rule and points to it, and no longer names str*.
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"Projects and packages" gets a section on Native AOT: (aot #t), where the
executable goes, what it gives and costs, and (aot-cpu ...) for the CPU it
is built for. The standard library chapter gets std/array and std/simd
after std/maths, and "Performance" a section on vectors: the kernels first,
a loop with its tail, masks, and when vectors pay, with the measurements
from the Advent of Code solutions. modules/std/array.sz and
modules/std/simd.sz are the reference pages, generated from the modules'
docs.
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Bjolang 0.2.0 reads a quoted literal with a grammar, and refuses #:tag
on a union case. The section on literals for your own types now declares
a def/grammar and shows its errors. The std/url summary says what the
compiler checks in a URL literal, and how a computed scheme, host or
port is made.
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The standard library chapter gets std/url after std/http: the quoted
literal that encodes each value for its part, parse-url's strict reading,
the round trip, url-resolve, the decoded parts and the encoders.
modules/std/url.sz is the reference page, generated from (std url)'s docs.
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(std bench) changed: a setup binds names, as let* does, and the body uses
them and the parameters by name instead of being a (fun ...). The deck's
benchmark file, the options table and the paragraphs on the setups and
parameters say so, with an example of the two setups used together. The
outputs are unchanged: the same benchmarks measure the same.
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A new section 2.9 between Testing and Performance: time-it, a benchmark file
for the deck, how a benchmark is measured, setup and parameters, the menu,
--detail and --scaling, --compare-within, saving and comparing, --against
with --processes, the flags, and --serve. Every output is from a real run.
It shows the weakness of comparing two processes too: unchanged benchmarks
called faster or SLOWER by a few percent, and how --processes 6 settles it.
The standard library chapter gets std/bench, std/stopwatch says time-it is
(std bench)'s, and modules/std/bench/ has the reference pages for (std
bench), (std bench stats) and (std bench store).
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(std stm), (std test) and (std mutable) are listed where their titles
put them, with (folders mixed) and (folder-marker? #f) from glasnost
0.3.12. The mutable folder is titled (std mutable), as the others are,
so that it sorts among them.
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(std test) and (std stm) were pages next to folders of their submodules, and
the std menu lists folders first, so each showed up twice, far apart. The
module page is now the folder's index.sz, so the menu has one entry for it,
and its submodules are listed at the top of the page and in the menu below.
(std test prop), (std test gen) and (std test expect) get pages, and the
standard library chapter says what they have and links to them.
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A new subsection under Performance with two tables from the benchmarks in
bench/collections. It says which operations each collection does cheaply,
and names the traps: vec-add in a loop, binding the rest of a vec in a
recursive match, and indexing into a list.
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Bjolang's peak in the service's closed loop was inflated by how its
program gathered samples, and Go's matched run was given that peak as its
limit. With the program fixed, Bjolang peaks at 369 MB on all cores, and
Go, given the larger corrected .NET peak, at 364.
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The primitive benchmarks are one table with all six columns, Bjolang's
two, Go's two and Hopac's two, with the introduction once and what each
comparison says after it. What each operation allocates is one paragraph
for all three.
The service section has a new run on the current runtime. Go with as
much memory as .NET has the shortest tail at 250k/s on four cores;
Bjolang has it at every higher load. Over three runs the row at 500k/s
on all cores moved too much to rank, and the text says so.
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A chain of two fibers no longer moves between cores when the inline
budget runs out, and the skewed choose takes 181 ns at best, not 230.
The ring rows move by a nanosecond or two, and the spawn row to 210 ns.
The text says that the spawn row is slow only on many cores: on two or
four, the current scheduler spawns faster than the pool did.
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The ring, spawn and choose rows are measured again. Spawn and choose cost
about twice what they did, with the scheduler that replaced the .NET
pool, and several sentences no longer held: an event synced alone costs
nothing over chan-put, a choose allocates 56 bytes, and Hopac's choose
stays ahead with a cancel IVar.
A new section gives bench/service against Go and Hopac: the closed loop,
and the open loop with latency taken from when a request was due.
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Part I's pattern matching chapter gets a section on (:at-least lo),
(:at-most hi), (:between lo hi), (:greater-than lo) and (:less-than hi):
what each matches, that they nest like any pattern, that the bounds are
literals, and that the ranges of integers and characters are added up
by the exhaustiveness check while those of doubles are not. The section
on exhaustiveness shows a counterexample in a gap between ranges.
The table of literals lists decimal and bigint, and the comment in the
inference example says which binding is pinned.
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Pages for (std eq), (std clr-ord), (std monad), (std effect),
(std hashset), (std orderedset), (std orderedmap), (std inbox),
(std ports), (std net), (std test), (std simpletest), (std stopwatch)
and (std syntax-match), and for the five (std mutable ...) modules in
a directory of their own, as (std stm) has. Part III has a short
section on each group with links to its pages.
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The Scopes section shows a with-scope in a defun, and own!, own-disposable
and release!. The Macros section has a section on by-colour.
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Part II's section on concurrency has a new subsection, "Shared state:
atomics and transactions": when to share data instead of sending it,
locations and atomically, the rules for a transaction function, waiting
with tx-retry, a transaction as an event in a choose, tx-or-else, the
queue, map and counter, and what transactions cost. The examples use
the card game and were compiled and run.
Part III has a section on std/stm that links the four reference pages:
(std stm), and (std stm queue), (std stm map) and (std stm counter) in
a directory of their own, as (text xml) has.
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The manual numbers its parts, sections and subsections, 1, 1.1, 1.1.1, in
its table of contents too. The titles that numbered themselves no longer
do: Part III is "The standard library", 3, and the appendices are 4.1 to
4.4 rather than A to D. The std/random section after the appendices is
gone; Part III has it.
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It said less than Appendix D does, and some of it was no longer true:
Appendix D covers bjomode.el and samizdat-mode.el.
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modules/std/prelude.sz is the prelude's page, made from the docs the
prelude was compiled with, builtins included. Part III starts with the
prelude and links to it, instead of pointing at Docs/prelude.org.
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The REPL no longer relies on rlwrap. Say what it does at a terminal
instead (history, Enter continuing an open form), how Tab completes,
and that :complete gives editors the same completions.
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The Go table is refreshed with a new run (the numbers moved within the
noise), and the section gains a Hopac part: the same rows on the same
.NET runtime, plain and with every operation raced against a cancel
IVar, with what the numbers show. Hopac is ahead without cancellation
and far behind with one shared cancel IVar, and allocates more.
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The channels section introduces chan-put and chan-get beside the event
forms. A new section compares the CML benchmarks with their Go twins, with
Bjolang measured both syncing events and with chan-put/chan-get and Go both
plain and racing ctx.Done(), and says what Bjolang has that Go does not:
events as values and structured scopes.
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- (.field value), and get, try-get, set and update for reading and copying
along a path of fields and keys, with ref-set in the generic operations.
- please-hoist-i-promise-i-am-not-naughty, in the macros section.
- (std set) is (std hashset), and the collector is hash-setting.
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The clause table, stopping early and nesting use the new names, and
count-lines uses :until instead of a counter that only drove the loop.
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There are no releases, so the section now says so, and gives the clone and
the build in the order Compiling.org has them: the runtime, the compiler,
the standard library. Updating is a pull and bjo rebjo. The editor support
paragraph links the repository it mentions.
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Co-Authored-By: eca-agent <git@eca.dev>
index.sz is a landing page pointing to the manual, now manual.sz, and to
modules/, where each library module has a page made by @generate-docs from
the docs it was compiled with. The chapters gain appendices, and part III
links each module to its page. glasnost's page cache is ignored.
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