From 81500312dcfdde2bd07c5071c7948a61b1f952ba Mon Sep 17 00:00:00 2001
From: lemon <lsof@mailbox.org>
Date: Sun, 7 Aug 2022 16:02:34 +0200
Subject: expand template at expression position

---
 bootstrap/parse.c   | 9 +++++++--
 bootstrap/test2.cff | 7 +++++++
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/bootstrap/parse.c b/bootstrap/parse.c
index 4094edb..e7f4a39 100644
--- a/bootstrap/parse.c
+++ b/bootstrap/parse.c
@@ -583,6 +583,7 @@ parseexpandtepl(struct parser *P, struct tepl *tepl) {
    const struct type *ty = NULL; 
    int i = 0;
 
+   lexexpect(P, '<');
    expan.span = container_of(tepl, struct decl, tepl)->span;
    expan.tepl = 1;
    while (!lexmatch(P, &tok, '>')) {
@@ -726,7 +727,6 @@ parsetype(struct parser *P) {
       if (decl->t == Dtype) {
          return decl->ty;
       } else if (decl->t == Dtepl && decl->tepl.t == Dtype) {
-         lexexpect(P, '<');
          return parseexpandtepl(P, (struct tepl *)&decl->tepl);         
       } else
          fatal(P, P->tokspan, "%T is not a type", tok);
@@ -974,8 +974,10 @@ pexprimary(struct parser *P) {
    decl:
       if (!decl)
          fatal(P, tok.span, "%T is not defined", tok);
+      const struct type *ty;
       if (decl->t == Dtype) {
-         const struct type *ty = decl->ty;
+         ty = decl->ty;
+      typedecl:
          if (ty->t == TYenum) {
             lexexpect(P, ':');
             P->targty = ty;
@@ -1001,6 +1003,9 @@ pexprimary(struct parser *P) {
       } else if (decl->t == Dmacro) {
          parseexpandmacro(P, &decl->macro);
          ex = parseexpr(P);
+      } else if (decl->t == Dtepl) {
+         ty = parseexpandtepl(P, (struct tepl *)&decl->tepl);
+         goto typedecl;
       } else {
          ex.t = Ename;
          ex.span = tok.span;
diff --git a/bootstrap/test2.cff b/bootstrap/test2.cff
index 66603ba..6fbb8fa 100644
--- a/bootstrap/test2.cff
+++ b/bootstrap/test2.cff
@@ -8,6 +8,10 @@ struct Node<T> {
    }
 }
 
+struct Bit<T> {
+   fn neg(x T) T { return ~x; }
+}
+
 extern fn main() void {
    let n Node<int> = {#null, 0};
    let n Node<int> = {&n, 1};
@@ -18,4 +22,7 @@ extern fn main() void {
    let x Node<f32> = {};
    n->ok();
    x->ok();
+
+   Bit<i32>:neg(3);
+   Bit<i64>:neg(3);
 }
-- 
cgit v1.2.3