use std/io use std/vec.Vec struct Counter { value: i32 } blocking func main(): i32! { var counters = Vec [Counter { value: 1 }, Counter { value: 2 }, Counter { value: 3 }] for counter in &+counters { counter.value += 10 } var borrowed_total: i32 = 0 for counter in &counters { borrowed_total += counter.value } var moved_total: i32 = 0 for counter in move counters { moved_total += counter.value } let message = "borrowed: ${borrowed_total}, moved: ${moved_total}\n" io.print(&message)? return 0 }

func main(): i32 { let value = load_value() catch failure { fallback_for(failure.message()) } if value == 42 { return 0 } return 1 } func load_value(): i32! { return error.new("example.unavailable", "the primary value is unavailable") } func fallback_for(message: &str): i32 { return 42 }

use std/task use std/time use std/time.Duration async func delayed(value: i32): i32 { await time.sleep(Duration.from_milliseconds(1)) return value } async func main(): i32! { let (left, right) = await task.join(delayed(20), delayed(22)) if left + right != 42 { return error.new("example.unexpected_total", "joined tasks returned the wrong total") } return 0 }

use std/io use std/url.Url blocking func main(): i32! { let url = Url.parse("HTTP://Example.COM:80/a/../status?q=ready#fragment")? let canonical = url.to_string() let authority = url.authority() let target = url.request_target() io.println(&canonical)? io.println(&authority)? io.println(&target)? return 0 }

nocter-frontend-bindings

Each required role has at most one exact declaration identity.
Source namespaces, direct-visibility sets, declaration-site sources, and nominal representation sources are define-once relations. Identical repeats are typed integrity failures rather than idempotent updates.
Authored and fallback namespaces reject duplicate names before freezing; no sorting or deduplication step may discard a conflicting producer.
Named builtin fallback and standard roles remain distinct authorities.
Source projection is not an input to role selection.
Body projection records one syntax root per semantic body identity. The declaration-owned body form determines whether that root must be a block or an expression; callers never infer the form from syntax or assume that every body is a block.

Nocter

nocter-frontend-bindings

Responsibility

Contract

Invariants

nocter-frontend-bindings#

Responsibility#

Contract#

Invariants#

nocter-frontend-bindings

Responsibility

Contract

Invariants