Dyn containers print without a space after the bracket, queued

TODO.org

@@ -304,6 +304,9 @@ compare bools, and a match over a bool takes true/false arms, exhaustive without
 Decided 2026-09-25: a let whose name no later statement of its block mentions prints
 flat, not as a nested block; a one-argument and/or prints as its argument.
 
+** NEXT A dyn vector prints as [1 2 3], a map as {:a 1}
+Decided 2026-09-25: no space after the opening bracket, in every renderer.
+
 ** WAIT ML-style patterns
 Held 2026-09-25 as a future direction, like the JS backend: nested destructuring,
 guards, or-patterns, literals at any depth, exhaustiveness over the nesting.

test/syntax/algorithms.fln

@@ -36,6 +36,18 @@ fn insertion-sort(coll: [$t]) -> () where ordered?($t)
       --(j)
     ++(i)
 
+fn insertion-sort-dyn(coll)
+  let i = 1
+  let length = length(coll)
+  while i < length
+    let j = i
+    while j > 0 and coll[j] < coll[dec(j)]
+      let temp = coll[j]
+        coll[j] = coll[dec(j)]
+        coll[dec(j)] = temp
+      --(j)
+    ++(i)
+
 fn main() -> i32 = 0
 
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