loader, iter: add shim for go1.22 and earlier

src/iter/iter.go

@@ -0,0 +1,17 @@
+//go:build !go1.23
+
+// Delete this file when TinyGo drops support for Go 1.22.
+
+package iter
+
+// Seq is an iterator over sequences of individual values.
+// When called as seq(yield), seq calls yield(v) for each value v in the sequence,
+// stopping early if yield returns false.
+// See the [iter] package documentation for more details.
+type Seq[V any] func(yield func(V) bool)
+
+// Seq2 is an iterator over sequences of pairs of values, most commonly key-value pairs.
+// When called as seq(yield), seq calls yield(k, v) for each pair (k, v) in the sequence,
+// stopping early if yield returns false.
+// See the [iter] package documentation for more details.
+type Seq2[K, V any] func(yield func(K, V) bool)