From 80fc13c8281c31c110366e1b4eb61e828fffe8c7 Mon Sep 17 00:00:00 2001
From: Hojun-Cho <ghwns6743@gmail.com>
Date: Sun, 9 Aug 2026 04:25:36 +0900
Subject: [PATCH] wcc: delete parser backtracking remnants

---
 cmd/wcc/parse.c | 18 ++++--------------
 1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/cmd/wcc/parse.c b/cmd/wcc/parse.c
index 0e31b020..95a34d8c 100644
--- a/cmd/wcc/parse.c
+++ b/cmd/wcc/parse.c
@@ -660,7 +660,6 @@ parseprimary(Parser *p)
 		advance(p);
 		while (p->cur.kind == TK_DOT && peek(p).kind == TK_IDENT) {
 			advance(p);
-			n = (Node*)n;
 			Node *mr = newnode(p->a, N_DOT, pp);
 			mr->lhs = n;
 			mr->str = p->cur.text;
@@ -896,7 +895,7 @@ parseexpr_top(Parser *p)
 }
 
 static Node *
-parselet(Parser *p, int top)
+parselet(Parser *p)
 {
 	Pos pp = p->cur.pos;
 	int is_const = 0;
@@ -931,7 +930,6 @@ parselet(Parser *p, int top)
 			m->op = TK_CONST;
 			for (Node *l = head; l; l = l->next) l->op = TK_CONST;
 		}
-		(void)top;
 		return m;
 	}
 
@@ -961,7 +959,6 @@ parselet(Parser *p, int top)
 			m->op = TK_CONST;
 			for (Node *l = head; l; l = l->next) l->op = TK_CONST;
 		}
-		(void)top;
 		return m;
 	}
 
@@ -969,7 +966,6 @@ parselet(Parser *p, int top)
 		first->rhs = parseexpr(p);
 	expect(p, TK_SEMI);
 	if (is_const) first->op = TK_CONST;
-	(void)top;
 	return first;
 }
 
@@ -1022,11 +1018,7 @@ parsefor(Parser *p)
 	/* First clause may be 'let' init or expr. If 'let' or terminated
 	 * by ';', it's a C-for. Otherwise it's just `for (cond)`. */
 	if (p->cur.kind == TK_LET) {
-		/* Disambiguate range form: `let IDENT .. expr`. We peek
-		 * for IDENT then DOTDOT before committing to parselet.
-		 * Tuple destructure: `let (a, b) .. expr`. */
-		Tok save_cur = p->cur;
-		(void)save_cur;
+		/* Range and three-clause forms share the `let` prefix. */
 		advance(p);
 		if (p->cur.kind == TK_LPAREN) {
 			advance(p);
@@ -1051,7 +1043,6 @@ parsefor(Parser *p)
 			return parse_for_else(p, rng);
 		}
 		if (p->cur.kind == TK_IDENT || p->cur.kind == TK_UNDER) {
-			Pos ip = p->cur.pos;
 			const char *nm = p->cur.text;
 			int isunder = p->cur.kind == TK_UNDER;
 			Tok la = peek(p);
@@ -1063,7 +1054,6 @@ parsefor(Parser *p)
 				rng->lhs = parseexpr(p);
 				expect(p, TK_RPAREN);
 				rng->body = parseblock(p);
-				(void)ip;
 				return parse_for_else(p, rng);
 			}
 		}
@@ -1163,7 +1153,7 @@ parsestmt(Parser *p)
 		return b;
 	}
 	case TK_LET:
-	case TK_CONST:		return parselet(p, 0);
+	case TK_CONST:		return parselet(p);
 	case TK_IF: {
 		Node *n = parseif(p);
 		expect(p, TK_SEMI);
@@ -1510,7 +1500,7 @@ parsefile(Parser *p)
 		case TK_TYPE:		d = parsetypedecl(p, exp); break;
 		case TK_FN:		d = parsefn(p, exp, attrs); break;
 		case TK_LET:
-		case TK_CONST:		d = parselet(p, 1); d->export = exp; break;
+		case TK_CONST:		d = parselet(p); d->export = exp; break;
 		default:
 			errorf(p->cur.pos, "expected top-level decl, got %s",
 			    tokname(p->cur.kind));