5 files changed, 25 insertions, 7 deletions

diff --git a/cgen.c b/cgen.c
index ec4c6ab..57eb93f 100644
--- a/cgen.c
+++ b/cgen.c
@@ -292,8 +292,6 @@ static bool cgen_fn_header(CGenerator *g, FnExpr *f, Location where) {
 			cgen_write(g, " ");
 			bool ptr = cgen_uses_ptr(&d->type);
 			if (ptr) {
-				fprint_type(stdout, &d->type);
-				puts("");
 				IdentDecl *idecl = ident_decl(*i);
 				assert(idecl);
 				idecl->flags |= IDECL_FLAG_CGEN_PTR;
diff --git a/decls_cgen.c b/decls_cgen.c
index 58d8667..58383f7 100644
--- a/decls_cgen.c
+++ b/decls_cgen.c
@@ -57,12 +57,14 @@ static bool cgen_decls_expr(CGenerator *g, Expression *e) {
 	case EXPR_FN:
 		e->fn.c.name = NULL;
 	    e->fn.c.id = g->ident_counter++;
+		fn_enter(&e->fn, 0);
 		if (!cgen_fn_header(g, &e->fn, e->where))
 			return false;
 		cgen_write(g, ";");
 		cgen_nl(g);
 		if (!cgen_decls_block(g, &e->fn.body))
 			return false;
+		fn_exit(&e->fn);
 		break;
 	case EXPR_TYPE:
 	case EXPR_DIRECT:
diff --git a/parse.c b/parse.c
index 9061e12..71936ba 100644
--- a/parse.c
+++ b/parse.c
@@ -723,6 +723,7 @@ static bool parse_expr(Parser *p, Expression *e, Token *end) {
 		default:
 		unrecognized:
 			tokr_err(t, "Unrecognized expression.");
+			t->token = end + 1;
 			return false;
 		}
 		t->token = end;
@@ -1282,7 +1283,6 @@ static bool parse_expr(Parser *p, Expression *e, Token *end) {
 			return true;
 		}
 		tokr_err(t, "Unrecognized expression.");
-		t->token = end + 1;
 		return false;
 	}
 }
diff --git a/test.toc b/test.toc
index 7aaeb3a..148b50a 100644
--- a/test.toc
+++ b/test.toc
@@ -16,5 +16,7 @@ putf @= fn(x: float) {
 Foo @= int;
 
 main @= fn() {
+	 f := fn(x: int) { p := &x; *p = 5; };
+	 // f(3);
 	 // x : Foo;
 };	
diff --git a/types.c b/types.c
index f2f4baf..2d4e702 100644
--- a/types.c
+++ b/types.c
@@ -99,6 +99,10 @@ static bool expr_arr_must_mut(Expression *e) {
 			err_print(e->where, "Cannot modify a constant array.");
 			return false;
 		}
+		if (d->flags & DECL_FLAG_PARAM) {
+			err_print(e->where, "Parameters are immutable.");
+			return false;
+		}
 	} return true;
 	case EXPR_CAST:
 	case EXPR_CALL:
@@ -887,10 +891,12 @@ static bool types_expr(Typer *tr, Expression *e) {
 		}
 	} break;
 	case EXPR_BINARY_OP: {
-		Type *lhs_type = &e->binary.lhs->type;
-		Type *rhs_type = &e->binary.rhs->type;
-		if (!types_expr(tr, e->binary.lhs)
-			|| !types_expr(tr, e->binary.rhs))
+		Expression *lhs = e->binary.lhs;
+		Expression *rhs = e->binary.rhs;
+		Type *lhs_type = &lhs->type;
+		Type *rhs_type = &rhs->type;
+		if (!types_expr(tr, lhs)
+			|| !types_expr(tr, rhs))
 			return false;
 		if (lhs_type->kind == TYPE_UNKNOWN || rhs_type->kind == TYPE_UNKNOWN) {
 			return true;
@@ -900,6 +906,16 @@ static bool types_expr(Typer *tr, Expression *e) {
 			if (!expr_must_lval(e->binary.lhs)) {
 				return false;
 			}
+			{
+				if (lhs->kind == EXPR_IDENT) {
+					Declaration *d = ident_decl(lhs->ident)->decl;
+					if (d->flags & DECL_FLAG_PARAM) {
+						err_print(e->where, "Parameters are immutable.");
+						return false;
+					}
+				}
+			}
+		
 			/* fallthrough */
 		case BINARY_ADD:
 		case BINARY_SUB: