rustc: Parse lets

2 files changed, 28 insertions, 1 deletions

diff --git a/src/comp/front/ast.rs b/src/comp/front/ast.rs
index 0b0f571c..34df06ad 100644
--- a/src/comp/front/ast.rs
+++ b/src/comp/front/ast.rs
@@ -76,7 +76,7 @@ tag stmt_ {
 
 type decl = spanned[decl_];
 tag decl_ {
-    decl_local(ident, bool, option[@ty]);
+    decl_local(ident, option[@ty], option[@expr]);
     decl_item(name, @item);
 }
 
diff --git a/src/comp/front/parser.rs b/src/comp/front/parser.rs
index 2571c5d7..877119de 100644
--- a/src/comp/front/parser.rs
+++ b/src/comp/front/parser.rs
@@ -541,6 +541,27 @@ io fn parse_expr(parser p) -> @ast.expr {
     }
 }
 
+io fn parse_let(parser p) -> @ast.decl {
+    auto lo = p.get_span();
+
+    expect(p, token.LET);
+    auto ty = parse_ty(p);
+    auto id = parse_ident(p);
+
+    auto init;
+    if (p.peek() == token.EQ) {
+        p.bump();
+        init = some(parse_expr(p));
+    } else {
+        init = none[@ast.expr];
+    }
+
+    expect(p, token.SEMI);
+
+    auto hi = p.get_span();
+    ret @spanned(lo, hi, ast.decl_local(id, some(ty), init));
+}
+
 io fn parse_stmt(parser p) -> @ast.stmt {
     auto lo = p.get_span();
     alt (p.peek()) {
@@ -553,6 +574,12 @@ io fn parse_stmt(parser p) -> @ast.stmt {
             ret @spanned(lo, hi, ast.stmt_log(e));
         }
 
+        case (token.LET) {
+            auto leht = parse_let(p);
+            auto hi = p.get_span();
+            ret @spanned(lo, hi, ast.stmt_decl(leht));
+        }
+
         // Handle the (few) block-expr stmts first.
 
         case (token.IF) {