Change @return! syntax to require ":" after faults. Update all contracts to consistently use ":" before the description.

lib/std/threads/event/event_thread.c3

@@ -171,7 +171,7 @@ fn void remove_all_pool_threads(EventThreadPool* pool) @local
 }
 
 <*
- @require size > 0 "Must have at least one thread"
+ @require size > 0 : "Must have at least one thread"
 *>
 fn EventThreadPool* EventThreadPool.init(&self, int size, String name, Allocator allocator, void* monitor_context)
 {

lib/std/threads/fixed_pool.c3

@@ -32,9 +32,9 @@ struct QueueItem @private
 }
 
 <*
- @require !self.initialized "ThreadPool must not be already initialized"
- @require threads > 0 && threads < 0x1000 `Threads should be greater than 0 and less than 0x1000`
- @require queue_size < 0x10000 `Queue size must be less than 65536`
+ @require !self.initialized : "ThreadPool must not be already initialized"
+ @require threads > 0 && threads < 0x1000 : `Threads should be greater than 0 and less than 0x1000`
+ @require queue_size < 0x10000 : `Queue size must be less than 65536`
 *>
 fn void! FixedThreadPool.init(&self, usz threads, usz queue_size = 0)
 {

lib/std/threads/os/thread_win32.c3

@@ -89,7 +89,7 @@ fn void! NativeMutex.lock(&mtx)
 
 
 <*
- @require mtx.timed "Only available for timed locks"
+ @require mtx.timed : "Only available for timed locks"
 *>
 fn void! NativeMutex.lock_timeout(&mtx, ulong ms)
 {

lib/std/threads/pool.c3

@@ -24,7 +24,7 @@ struct QueueItem @private
 }
 
 <*
- @require !self.initialized "ThreadPool must not be already initialized"
+ @require !self.initialized : "ThreadPool must not be already initialized"
 *>
 fn void! ThreadPool.init(&self)
 {