parser: set is_public of TypeSymbol for fn type decl (#10212)

vlib/v/parser/parser.v

@@ -2997,6 +2997,7 @@ fn (mut p Parser) type_decl() ast.TypeDecl {
 		// function type: `type mycallback = fn(string, int)`
 		fn_name := p.prepend_mod(name)
 		fn_type := p.parse_fn_type(fn_name)
+		p.table.get_type_symbol(fn_type).is_public = is_pub
 		type_pos = type_pos.extend(p.tok.position())
 		comments = p.eat_comments(same_line: true)
 		return ast.FnTypeDecl{

vlib/v/tests/imported_symbols_test.v

@@ -1,6 +1,10 @@
 module main
 
-import geometry { Line, Point, Shape, module_name, point_str }
+import geometry { Line, Point, PointCond, Shape, module_name, point_str }
+
+fn point_is(p Point, cond PointCond) bool {
+	return cond(p)
+}
 
 fn test_imported_symbols_types() {
 	// struct init
@@ -17,6 +21,11 @@ fn test_imported_symbols_types() {
 		ps: [p0, p1]
 	}
 	assert l0.ps[0].y == 20
+
+	cond := fn (p Point) bool {
+		return p.x == 10
+	}
+	assert point_is(p0, cond)
 }
 
 fn test_imported_symbols_functions() {

vlib/v/tests/modules/geometry/geometry.v

@@ -35,3 +35,5 @@ pub fn (a Point) str() string {
 pub fn point_str(a Point) string {
 	return a.str()
 }
+
+pub type PointCond = fn (p Point) bool