Add exception X::Syntax::Term::MissingInitializer

Author: usev6

lib/Type/X/Syntax/Term/MissingInitializer.pod

@@ -0,0 +1,23 @@
+=begin pod
+
+=TITLE class X::Syntax::Term::MissingInitializer
+
+    class X::Syntax::Term::MissingInitializer does X::Syntax { }
+
+Syntax error when a term (a backslash variable) is declared without 
+initialization assignment.
+
+For example
+
+    my \foo
+
+dies with
+
+    ===SORRY!===
+    Term definition requires an initializer
+
+Valid code would be
+
+    my \foo = 42;
+
+=end pod

type-graph.txt

@@ -384,6 +384,7 @@ class X::Syntax::NoSelf                            does X::Syntax
 class X::Syntax::Number::RadixOutOfRange           does X::Syntax
 class X::Syntax::Regex::Adverb                     does X::Syntax
 class X::Syntax::Signature::InvocantMarker         does X::Syntax
+class X::Syntax::Term::MissingInitializer          does X::Syntax
 class X::Syntax::Extension::Category               does X::Syntax
 class X::Syntax::InfixInTermPosition               does X::Syntax
 class X::Syntax::Pod::BeginWithoutIdentifier       does X::Syntax does X::Pod