close some gaps in the type system

examples/programs/comptime_type_params/main.bro

@@ -38,6 +38,10 @@ fixed_len func($T type, $N usize, value @Fixed(T, N)) usize {
 	return value.values.len
 }
 
+same_type func($Expected, $Actual type, _ Actual) bool {
+	return $(Expected == Actual)
+}
+
 take_i32 func(value i32) i32 {
 	return value
 }
@@ -87,5 +91,12 @@ main func() i32 {
 	_ = assigned
 	_ = take_i32(zero())
 	_ = return_zero()
+	optional ?u32 = none
+	if !same_type(?u32, optional) {
+		return 8
+	}
+	if same_type(?u16, optional) {
+		return 9
+	}
 	return 0
 }

examples/programs/yield/main.bro

@@ -85,6 +85,11 @@ vif_defer func() i32 {
 	return r # 5
 }
 
+vif_expression func(old_entries []u8) usize {
+	new_size :: if (old_entries.len > 0) old_entries.len * 2 else 8
+	return new_size
+}
+
 # --- value loops (milestone 20.5) --------------------------------------------
 
 # Labeled `for` used as a value: `yield :blk i` exits early with a value, the
@@ -306,6 +311,8 @@ main func() i32 {
 	if (vif_reassign(0) != 7) return 110
 	if (vif_reassign(9) != 9) return 111
 	if (vif_defer() != 5) return 112
+	if (vif_expression("") != 8) return 136
+	if (vif_expression("abc") != 6) return 137
 
 	if (loop_search() != 0) return 113
 	if (loop_none() != 0) return 114