pointer field passthrough

TODO.md

@@ -141,6 +141,9 @@
   - backing-type operators and reverse explicit conversions remain deferred
   - concrete runtime backing types are supported; unresolved, `int`, `void`, function, and opaque backings are rejected
 
+9. allow pointer field access pass-through (implemented)
+  - having a pointer (`ptr`) to a struct, we should allow access through `ptr.field` as opposed to mandating `ptr^.field`
+
 ## A word on multi-unwrap
 
 Unwrap multiple optionals with `and`. This **short-circuits**: if the first optional is none, subsequent expressions are not evaluated.

testbed/main.bro

@@ -0,0 +1,87 @@
+printf :: c_func(format *c_char, ...) c_int
+
+PlayerID :: distinct u32
+
+Tier :: enum(u8) {
+	bronze = 1
+	silver
+	gold
+}
+
+Player :: struct {
+	id PlayerID
+	name *c_char
+	tier Tier
+	score i32
+	streak i32
+	active bool
+}
+
+tier_bonus :: func(tier Tier) i32 {
+	if tier == .gold {
+		return 30
+	} else if tier == .silver {
+		return 15
+	}
+	return 5
+}
+
+projected_score :: func(player Player) i32 {
+	total i32 = player.score
+	total += tier_bonus(player.tier)
+	if player.active and player.streak > 2 {
+		total += player.streak * 3
+	}
+	return total
+}
+
+apply_decay :: func(players []mut Player) void {
+	for players |@player| {
+		if !player.active {
+			player.score -= 4
+		}
+	}
+}
+
+best_player :: func(players []mut Player) ?@mut Player {
+	best ?@mut Player = none
+	best_score i32 = 0
+
+	for players |@player| {
+		score :: projected_score(player^)
+		if best |_| {
+			if score > best_score {
+				best = player
+				best_score = score
+			}
+		} else {
+			best = player
+			best_score = score
+		}
+	}
+
+	return best
+}
+
+main :: func() i32 {
+	players [4]mut Player = [
+		Player { id = PlayerID(1), name = "Ada", tier = .gold, score = 41, streak = 4, active = true },
+		Player { id = PlayerID(2), name = "Ken", tier = .silver, score = 56, streak = 1, active = true },
+		Player { id = PlayerID(3), name = "Edsger", tier = .bronze, score = 64, streak = 0, active = false },
+		Player { id = PlayerID(4), name = "Grace", tier = .gold, score = 33, streak = 5, active = true },
+	]
+
+	apply_decay((&players)[..])
+
+	for (&players) |@player, index| {
+		score :: projected_score(player^)
+		_ = printf("%d: %s projected=%d\n", index, player.name, score)
+	}
+
+	if best_player((&players)[..]) |winner : projected_score(winner^) >= 80| {
+		_ = printf("winner: %s\n", winner.name)
+		return 0
+	}
+
+	return 1
+}