From 9a03e18b8165b783e80336a0e81978a927820c55 Mon Sep 17 00:00:00 2001
From: Swastik Baranwal <swstkbaranwal@gmail.com>
Date: Thu, 28 Sep 2023 21:29:45 +0530
Subject: [PATCH] fmt: keep anon struct decl fields in interfaces (#19461)

---
 vlib/v/fmt/fmt.v                                    | 12 +++++++++++-
 vlib/v/fmt/tests/interface_anon_struct_decl_keep.vv |  5 +++++
 2 files changed, 16 insertions(+), 1 deletion(-)
 create mode 100644 vlib/v/fmt/tests/interface_anon_struct_decl_keep.vv

diff --git a/vlib/v/fmt/fmt.v b/vlib/v/fmt/fmt.v
index 7b9b960001a422..110ba101f85d4f 100644
--- a/vlib/v/fmt/fmt.v
+++ b/vlib/v/fmt/fmt.v
@@ -1380,7 +1380,17 @@ pub fn (mut f Fmt) interface_field(field ast.StructField) {
 	if before_comments.len > 0 {
 		f.comments(before_comments, level: .indent)
 	}
-	f.write('\t${field.name} ${ft}')
+	sym := f.table.sym(field.typ)
+	if sym.info is ast.Struct {
+		if sym.info.is_anon {
+			f.write('\t${field.name} ')
+			f.write_anon_struct_field_decl(field.typ, ast.StructDecl{ fields: sym.info.fields })
+		} else {
+			f.write('\t${field.name} ${ft}')
+		}
+	} else {
+		f.write('\t${field.name} ${ft}')
+	}
 	if end_comments.len > 0 {
 		f.comments(end_comments, level: .indent)
 	} else {
diff --git a/vlib/v/fmt/tests/interface_anon_struct_decl_keep.vv b/vlib/v/fmt/tests/interface_anon_struct_decl_keep.vv
new file mode 100644
index 00000000000000..ba784fdc85b1fe
--- /dev/null
+++ b/vlib/v/fmt/tests/interface_anon_struct_decl_keep.vv
@@ -0,0 +1,5 @@
+interface Foo {
+	field struct {
+		bar int
+	}
+}