From a1e0f2bc46fb828e55d3f605191042468913a19d Mon Sep 17 00:00:00 2001
From: Miccah <m.castorina93@gmail.com>
Date: Sun, 7 Mar 2021 07:28:43 -0600
Subject: [PATCH] gen: add argument names to compile-time method struct (#9174)

---
 vlib/builtin/builtin.v                   |  3 ++-
 vlib/v/gen/c/comptime.v                  |  2 +-
 vlib/v/tests/comptime_method_args_test.v | 14 ++++++++++++++
 3 files changed, 17 insertions(+), 2 deletions(-)
 create mode 100644 vlib/v/tests/comptime_method_args_test.v

diff --git a/vlib/builtin/builtin.v b/vlib/builtin/builtin.v
index 0d089c97fd..cbf2161a26 100644
--- a/vlib/builtin/builtin.v
+++ b/vlib/builtin/builtin.v
@@ -88,7 +88,8 @@ fn __print_assert_failure(i &VAssertMetaInfo) {
 // MethodArgs holds type information for function and/or method arguments.
 pub struct MethodArgs {
 pub:
-	typ int
+	typ  int
+	name string
 }
 
 // FunctionData holds information about a parsed function.
diff --git a/vlib/v/gen/c/comptime.v b/vlib/v/gen/c/comptime.v
index 09fe309cd0..90e3be7df0 100644
--- a/vlib/v/gen/c/comptime.v
+++ b/vlib/v/gen/c/comptime.v
@@ -336,7 +336,7 @@ fn (mut g Gen) comp_for(node ast.CompFor) {
 				// Skip receiver arg
 				for j, arg in method.params[1..] {
 					typ := arg.typ.idx()
-					g.write(typ.str())
+					g.write('{$typ.str(), _SLIT("$arg.name")}')
 					if j < len - 1 {
 						g.write(', ')
 					}
diff --git a/vlib/v/tests/comptime_method_args_test.v b/vlib/v/tests/comptime_method_args_test.v
new file mode 100644
index 0000000000..5cec5fe050
--- /dev/null
+++ b/vlib/v/tests/comptime_method_args_test.v
@@ -0,0 +1,14 @@
+struct TestStruct {}
+
+fn (t TestStruct) test(arg1 string, arg2 string, arg3 string) {}
+
+fn test_comptime_method_names() {
+	$for method in TestStruct.methods {
+		if method.name == 'test' {
+			args := method.args
+			assert args[0].name == 'arg1'
+			assert args[1].name == 'arg2'
+			assert args[2].name == 'arg3'
+		}
+	}
+}