Catch up with four facts that moved while this page sat on a branch

The quote checker found three of them on the first run against the new tip: the
sand hash was changed deliberately by the grid lane, break and continue now
refuse by name instead of reading as unknown functions, and the usage text grew
--debug. The prelude also grew a string and UTF-8 family the table did not list.

web/examples/quotes.sh

@@ -56,7 +56,8 @@ for pair in \
   'fnty:(defn f [g (Fn [i32] i32)] i32 (g 1))' \
   'quoted:(defn f [] i32 (quote a))' \
   'deferblock:(defn f [] i32 (let [x 1] (defer (print-line "a")) x))' \
-  'i64index:(defconst xs [3 i32] [1 2 3]) (defn main [] i32 (let [i (i64 1)] (at xs i)))'
+  'i64index:(defconst xs [3 i32] [1 2 3]) (defn main [] i32 (let [i (i64 1)] (at xs i)))' \
+  'break:(defn main [] (let [i 0] (while (< i 3) (break))))'
 do
   name=${pair%%:*}; src=${pair#*:}
   printf '%s\n' "$src" > "$here/.q.flan"

web/index.html

@@ -217,7 +217,7 @@ $ ./_build/default/bin/main.exe run calc-me.flan "1 + 2 * (3 - 0.5) / 2"
 
 <pre><code class="sh">$ flan
 usage: flan (read|parse|check|emit|shim) &lt;file.flan&gt;...
-       flan build &lt;file.flan&gt; [-o out] [--no-bounds-checks] [--dev] [--target=wasm32-wasi]
+       flan build &lt;file.flan&gt; [-o out] [--no-bounds-checks] [--dev] [--debug] [--target=wasm32-wasi]
        flan run &lt;file.flan&gt; [args...]
        flan reload &lt;program.flan&gt; &lt;forms.flan&gt; [-o out.so]
        flan dev &lt;program.flan&gt; [-s socket]</code></pre>
@@ -528,10 +528,13 @@ a body that changes it cannot change the trip count, and the loop variable is no
 assignable.</p>
 
 <p>Loops are imperative, with <code>while</code>, <code>until</code> and
-<code>return</code>. There is no <code>loop</code>/<code>recur</code>, and there is no
-<code>break</code> or <code>continue</code> either — both are planned and neither
-exists, so today they report as <code>unknown function break</code>. An early exit out
-of a loop is <code>return</code>, as <code>first-even</code> does above.</p>
+<code>return</code>. There is no <code>loop</code>/<code>recur</code>. There is no
+<code>break</code> or <code>continue</code> yet either; both refuse by name:</p>
+
+<pre><code class="sh">break is not implemented yet (see the build sequence in plan.org)</code></pre>
+
+<p>An early exit out of a loop is <code>return</code>, as <code>first-even</code> does
+above.</p>
 
 <h3>Option, <code>match</code> and <code>some</code></h3>
 
@@ -641,6 +644,8 @@ ordinary Flan.</p>
 <tr><td>slices of <code>i32</code></td><td><code>swap-i32!</code>, <code>reverse-i32!</code>, <code>sort-i32!</code>, <code>index-of-i32</code>, <code>min-i32</code>, <code>max-i32</code>, <code>sum-i32</code></td></tr>
 <tr><td>bytes</td><td><code>bytes=?</code>, <code>starts-with?</code>, <code>ends-with?</code>, <code>index-of-byte</code>, <code>index-of-bytes</code>, <code>trim</code>, <code>digit?</code>, <code>space?</code></td></tr>
 <tr><td>parsing</td><td><code>parse-i64</code>, <code>parse-f64</code></td></tr>
+<tr><td>text</td><td><code>split-on-byte</code>, <code>split-next!</code>, <code>lower-ascii</code>, <code>upper-ascii</code>, <code>bytes-ci=?</code></td></tr>
+<tr><td>UTF-8</td><td><code>decode-rune</code>, <code>rune-at</code>, <code>rune-count</code>, <code>rune-size</code>, <code>rune-start?</code>, <code>valid-utf8?</code>, <code>encode-rune!</code></td></tr>
 <tr><td>numbers</td><td><code>sign-f32</code>, <code>lerp</code>, <code>floor-f32</code>, <code>ceil-f32</code>, <code>round-f32</code>, and <code>sqrt-f32</code>, which is the one <code>declare</code> in the file</td></tr>
 <tr><td>random</td><td><code>rand-seed</code>, <code>rand-u32</code>, <code>rand-f32</code>, <code>rand-i32-range</code>, <code>rand-f32-range</code></td></tr>
 </table>
@@ -1189,10 +1194,10 @@ module, and the headless sand acceptance program prints the same 64-bit hash und
 it does natively:</p>
 
 <pre><code class="sh">$ flan run test/programs/sand-headless.flan
-2256461126764447066
+-2851001042534928384
 $ flan build test/programs/sand-headless.flan --target=wasm32-wasi -o sand.wasm
 $ node --no-warnings test/wasm-run.mjs sand.wasm
-2256461126764447066</code></pre>
+-2851001042534928384</code></pre>
 
 <p>That number is the whole point of writing the RNG in Flan rather than calling libc's:
 a grid hash is only a regression test if the sequence is byte-identical on both targets.
@@ -1206,6 +1211,12 @@ module to bind to; release builds call directly, emit constants as constants, an
 the folding back. Dev builds are not pruned by reachability, because what a REPL may
 redefine next is not a function of what has been called so far.</p>
 
+<p><code>--debug</code> is a third flag beside <code>--dev</code> and the optimisation
+level. <code>--dev</code> asks whether you can redefine the program while it runs;
+<code>--debug</code> asks whether you can stop it and read it. It emits DWARF, sets
+<code>-O0</code>, and is refused by name for wasm32. lldb needs no plugin to read a
+Flan struct: the struct is its C struct.</p>
+
 <p>Some things are refused by name rather than half-supported, and both cross-target
 refusals say why:</p>