parser: embed always public and mutable (#7722)

vlib/v/parser/struct.v

@@ -158,7 +158,7 @@ fn (mut p Parser) struct_decl() ast.StructDecl {
 			field_start_pos := p.tok.position()
 			is_embed := ((p.tok.lit.len > 1 && p.tok.lit[0].is_capital()) ||
 				p.peek_tok.kind == .dot) &&
-				language == .v && ast_fields.len == 0
+				language == .v && ast_fields.len == 0 && !(is_field_mut || is_field_mut || is_field_global)
 			mut field_name := ''
 			mut typ := table.Type(0)
 			mut type_pos := token.Position{}
@@ -250,8 +250,16 @@ fn (mut p Parser) struct_decl() ast.StructDecl {
 				typ: typ
 				default_expr: ast.ex2fe(default_expr)
 				has_default_expr: has_default_expr
-				is_pub: is_field_pub
+				is_pub: if is_embed {
-				is_mut: is_field_mut
+					true
+				} else {
+					is_field_pub
+				}
+				is_mut: if is_embed {
+					true
+				} else {
+					is_field_mut
+				}
 				is_global: is_field_global
 				attrs: p.attrs
 			}

vlib/v/parser/tests/embed_pub_mut_err.out

@@ -0,0 +1,7 @@
+vlib/v/parser/tests/embed_pub_mut_err.vv:6:1: error: expecting type declaration
+    4 | pub mut:
+    5 |     Context
+    6 | }
+      | ^
+    7 |
+    8 | fn main() {

vlib/v/parser/tests/embed_pub_mut_err.vv

@@ -0,0 +1,9 @@
+struct Context {}
+
+struct App {
+pub mut:
+	Context
+}
+
+fn main() {
+}

vlib/v/tests/field_publicity/embed.v

@@ -0,0 +1,10 @@
+module field_publicity
+
+pub struct Context {
+pub:
+	name string
+}
+
+pub struct App {
+	Context
+}

vlib/v/tests/struct_embed_test.v

@@ -1,4 +1,5 @@
 import flag
+import field_publicity
 
 struct Foo {
 	x int
@@ -80,6 +81,11 @@ fn test_assign() {
 	assert h.x == 5
 }
 
+fn test_embed_is_public() {
+	a := field_publicity.App{}
+	assert a.Context.name == ''  
+}
+
 struct Eggs {}
 
 fn (f &Eggs) test(x int) int {
@@ -94,3 +100,8 @@ fn test_embed_method_receiver_ptr() {
 	b := Breakfast{}
 	assert b.test(5) == 5
 }
+
+fn test_embed_mutable() {
+	mut a := field_publicity.App{}
+	a.Context = field_publicity.Context{}
+}