From 670820cc596c2ec93561dd01e615821b69086f8d Mon Sep 17 00:00:00 2001
From: Alexander Medvednikov <alexander@medvednikov.com>
Date: Wed, 27 May 2020 16:00:00 +0200
Subject: [PATCH] parser: do not allow 1 char struct names

---
 vlib/v/checker/tests/struct_pub_field.out | 2 +-
 vlib/v/checker/tests/struct_pub_field.vv  | 4 ++--
 vlib/v/parser/struct.v                    | 3 +++
 3 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/vlib/v/checker/tests/struct_pub_field.out b/vlib/v/checker/tests/struct_pub_field.out
index f7e4d056cf..9a7fefc9e8 100644
--- a/vlib/v/checker/tests/struct_pub_field.out
+++ b/vlib/v/checker/tests/struct_pub_field.out
@@ -1,4 +1,4 @@
-vlib/v/checker/tests/struct_pub_field.v:9:4: error: field `i` of struct `A` is immutable
+vlib/v/checker/tests/struct_pub_field.v:9:4: error: field `i` of struct `Foo` is immutable
     7 |         i: 1
     8 |     }
     9 |     a.i = 2
diff --git a/vlib/v/checker/tests/struct_pub_field.vv b/vlib/v/checker/tests/struct_pub_field.vv
index df9f190061..1f104cac14 100644
--- a/vlib/v/checker/tests/struct_pub_field.vv
+++ b/vlib/v/checker/tests/struct_pub_field.vv
@@ -1,9 +1,9 @@
-struct A {
+struct Foo {
 	i int
 }
 
 fn main() {
-	a := A{
+	a := Foo{
 		i: 1
 	}
 	a.i = 2
diff --git a/vlib/v/parser/struct.v b/vlib/v/parser/struct.v
index 7df5732219..f83e50c4c8 100644
--- a/vlib/v/parser/struct.v
+++ b/vlib/v/parser/struct.v
@@ -41,6 +41,9 @@ fn (mut p Parser) struct_decl() ast.StructDecl {
 	if language == .v && p.mod != 'builtin' && name.len > 0 && !name[0].is_capital() {
 		p.error_with_pos('struct name `$name` must begin with capital letter', end_pos)
 	}
+	if name.len == 1 {
+		p.error_with_pos('struct names must have more than one character', end_pos)
+	}
 	// println('struct decl $name')
 	mut ast_fields := []ast.StructField{}
 	mut fields := []table.Field{}