From bf4b43a2f7257c3beb202790551a1312e4dd40b1 Mon Sep 17 00:00:00 2001
From: mlugg <mlugg@mlugg.co.uk>
Date: Sat, 10 Jun 2023 00:26:23 +0100
Subject: [PATCH] AstGen: handle ref_table for params

This is kind of similar to 1a4b0d9. In this case, we need to handle
ref_table when appending the body of param instructions.

Resolves: #15952
---
 src/AstGen.zig         |  8 ++++----
 test/behavior/call.zig | 13 +++++++++++++
 2 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/src/AstGen.zig b/src/AstGen.zig
index f8bb24c14d..b38067fd03 100644
--- a/src/AstGen.zig
+++ b/src/AstGen.zig
@@ -11761,9 +11761,9 @@ const GenZir = struct {
     ) !Zir.Inst.Index {
         const gpa = gz.astgen.gpa;
         const param_body = param_gz.instructionsSlice();
+        const body_len = gz.astgen.countBodyLenAfterFixups(param_body);
         try gz.astgen.instructions.ensureUnusedCapacity(gpa, 1);
-        try gz.astgen.extra.ensureUnusedCapacity(gpa, @typeInfo(Zir.Inst.Param).Struct.fields.len +
-            param_body.len);
+        try gz.astgen.extra.ensureUnusedCapacity(gpa, @typeInfo(Zir.Inst.Param).Struct.fields.len + body_len);
 
         const doc_comment_index = if (first_doc_comment) |first|
             try gz.astgen.docCommentAsStringFromFirst(abs_tok_index, first)
@@ -11773,9 +11773,9 @@ const GenZir = struct {
         const payload_index = gz.astgen.addExtraAssumeCapacity(Zir.Inst.Param{
             .name = name,
             .doc_comment = doc_comment_index,
-            .body_len = @intCast(u32, param_body.len),
+            .body_len = @intCast(u32, body_len),
         });
-        gz.astgen.extra.appendSliceAssumeCapacity(param_body);
+        gz.astgen.appendBodyWithFixups(param_body);
         param_gz.unstack();
 
         const new_index = @intCast(Zir.Inst.Index, gz.astgen.instructions.len);
diff --git a/test/behavior/call.zig b/test/behavior/call.zig
index c1bd1ae76d..4645a2ad9e 100644
--- a/test/behavior/call.zig
+++ b/test/behavior/call.zig
@@ -415,3 +415,16 @@ test "inline while with @call" {
     }
     try expect(a == 10);
 }
+
+test "method call as parameter type" {
+    const S = struct {
+        fn foo(x: anytype, y: @TypeOf(x).Inner()) @TypeOf(y) {
+            return y;
+        }
+        fn Inner() type {
+            return u64;
+        }
+    };
+    try expectEqual(@as(u64, 123), S.foo(S{}, 123));
+    try expectEqual(@as(u64, 500), S.foo(S{}, 500));
+}