test: refactor parser initialization in test suite

Author: wenxuanjun

src/server/features_formatting_test.v

@@ -16,7 +16,10 @@ fn test_large_file() {
 	ls.setup_vpaths()
 
 	uri := lsp.document_uri_from_path(test_file)
-	res := parser.parse_code(src)
+
+	mut p := parser.Parser.new()
+	defer { p.free() }
+	res := p.parse_code(src)
 	psi_file := psi.new_psi_file(uri.path(), res.tree, res.source_text)
 	ls.opened_files[uri] = analyzer.OpenedFile{
 		uri:      uri

src/tools/project-checker.v

@@ -109,10 +109,12 @@ pub fn (mut i Checker) check() {
 
 pub fn (mut c Checker) check_file(path string) []ErrorInfo {
 	content := os.read_file(path) or { return [] }
-	res := parser.parse_code(content)
 
-	root := res.tree.root_node()
+	mut p := parser.Parser.new()
+	defer { p.free() }
+	res := p.parse_code(content)
 
+	root := res.tree.root_node()
 	errors := c.check_node(path, AstNode(root))
 
 	// unsafe { res.tree.free() }