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+// Test for loops.
+
+--- for-loop-basic ---
+
+// Empty array.
+#for x in () [Nope]
+
+// Dictionary is traversed in insertion order.
+// Should output `Name: Typst. Age: 2.`.
+#for (k, v) in (Name: "Typst", Age: 2) [
+  #k: #v.
+]
+
+// Block body.
+// Should output `[1st, 2nd, 3rd, 4th]`.
+#{
+  "["
+  for v in (1, 2, 3, 4) {
+    if v > 1 [, ]
+    [#v]
+    if v == 1 [st]
+    if v == 2 [nd]
+    if v == 3 [rd]
+    if v >= 4 [th]
+   }
+   "]"
+}
+
+// Content block body.
+// Should output `2345`.
+#for v in (1, 2, 3, 4, 5, 6, 7) [#if v >= 2 and v <= 5 { repr(v) }]
+
+// Map captured arguments.
+#let f1(..args) = args.pos().map(repr)
+#let f2(..args) = args.named().pairs().map(p => repr(p.first()) + ": " + repr(p.last()))
+#let f(..args) = (f1(..args) + f2(..args)).join(", ")
+#f(1, a: 2)
+
+--- for-loop-integrated ---
+#let out = ()
+
+// Values of array.
+#for v in (1, 2, 3) {
+  out += (v,)
+}
+
+// Indices and values of array.
+#for (i, v) in ("1", "2", "3").enumerate() {
+  test(repr(i + 1), v)
+}
+
+// Pairs of dictionary.
+#for v in (a: 4, b: 5) {
+  out += (v,)
+}
+
+// Keys and values of dictionary.
+#for (k, v) in (a: 6, b: 7) {
+  out += (k,)
+  out += (v,)
+}
+
+#test(out, (1, 2, 3, ("a", 4), ("b", 5), "a", 6, "b", 7))
+
+// Grapheme clusters of string.
+#let first = true
+#let joined = for c in "abc👩‍👩‍👦‍👦" {
+  if not first { ", " }
+  first = false
+  c
+}
+
+#test(joined, "a, b, c, 👩‍👩‍👦‍👦")
+
+// Return value.
+#test(for v in "" [], none)
+#test(type(for v in "1" []), content)
+
+--- for-loop-over-bool ---
+// Uniterable expression.
+// Error: 11-15 cannot loop over boolean
+#for v in true {}
+
+--- for-loop-over-string ---
+// Keys and values of strings.
+// Error: 6-12 cannot destructure values of string
+#for (k, v) in "hi" {
+  dont-care
+}
+
+--- for-loop-destructuring-without-parentheses ---
+// Destructuring without parentheses.
+// Error: 7-8 unexpected comma
+// Hint: 7-8 destructuring patterns must be wrapped in parentheses
+#for k, v in (a: 4, b: 5) {
+  dont-care
+}
+
+--- for-loop-destructuring-half ---
+// Error: 7-8 unexpected comma
+// Hint: 7-8 destructuring patterns must be wrapped in parentheses
+#for k, in () {}
+
+--- for-loop-incomplete ---
+// Error: 5 expected pattern
+#for
+
+// Error: 5 expected pattern
+#for//
+
+// Error: 6 expected pattern
+#{for}
+
+// Error: 7 expected keyword `in`
+#for v
+
+// Error: 10 expected expression
+#for v in
+
+// Error: 15 expected block
+#for v in iter
+
+// Error: 5 expected pattern
+#for
+v in iter {}
+
+// Error: 7-10 expected pattern, found string
+// Error: 16 expected block
+A#for "v" thing
+
+// Error: 6-9 expected pattern, found string
+#for "v" in iter {}
+
+// Error: 7 expected keyword `in`
+#for a + b in iter {}