This is the related vala update.



commit 2dc47785171f8f62f7f017939681e0d5cf3e9847
Author: Rico Tzschichholz <ricotz@ubuntu.com>
Date:   Thu Dec 14 10:23:14 2017 +0100

    Release taken references to CodeContext after using it
    
    https://bugzilla.gnome.org/show_bug.cgi?id=712694
---
 vala/valaparser.vala | 1 +
 1 file changed, 1 insertion(+)

diff --git a/vala/valaparser.vala b/vala/valaparser.vala
index ec5e34e82..6228ba98e 100644
--- a/vala/valaparser.vala
+++ b/vala/valaparser.vala
@@ -76,6 +76,7 @@ public class Vala.Parser : CodeVisitor {
        public void parse (CodeContext context) {
                this.context = context;
                context.accept (this);
+               this.context = null;
        }
 
        public override void visit_source_file (SourceFile source_file) {




We have these lines in ide-vala-index.vala

		public ValaIndex (Ide.Context context)
		{
			...
			this.parser = new Vala.Parser ();
			this.parser.parse (this.code_context);
			...
		}



		void reparse ()
		{
			this.report.clear ();

			foreach (var source_file in this.code_context.get_source_files ()) {
				if (source_file.get_nodes ().size == 0) {
					this.parser.visit_source_file (source_file);
					if (source_file is Ide.ValaSourceFile) {
						(source_file as Ide.ValaSourceFile).dirty = false;
					}
				}
			}
		}


Vala.Parser.visit_source_files() tries to use Vala.CodeContext internally but it is set as null already. It shows messages like this and indexing job seems to fail.

10:16:45.0013                                    (null)[ 17591]: CRITICAL: vala_code_context_get_run_output: assertion 'self != NULL' failed
10:16:45.0013                                    (null)[ 17591]: CRITICAL: vala_code_context_get_root: assertion 'self != NULL' failed
10:16:45.0013                                    (null)[ 17591]: CRITICAL: vala_parser_parse_using_directives: assertion 'ns != NULL' failed
10:16:45.0013                                    (null)[ 17591]: CRITICAL: vala_code_context_get_root: assertion 'self != NULL' failed
10:16:45.0013                                    (null)[ 17591]: CRITICAL: vala_parser_parse_declarations: assertion 'parent != NULL' failed
10:16:45.0013                                    (null)[ 17591]: CRITICAL: vala_code_context_get_run_output: assertion 'self != NULL' failed
10:16:45.0013                                    (null)[ 17591]: CRITICAL: vala_code_context_get_root: assertion 'self != NULL' failed
10:16:45.0013                                    (null)[ 17591]: CRITICAL: vala_parser_parse_using_directives: assertion 'ns != NULL' failed
10:16:45.0013                                    (null)[ 17591]: CRITICAL: vala_code_context_get_root: assertion 'self != NULL' failed
10:16:45.0013                                    (null)[ 17591]: CRITICAL: vala_parser_parse_declarations: assertion 'parent != NULL' failed