Fix resolving namespace keyword

ChangeLog.md

@@ -3,6 +3,12 @@ XP AST ChangeLog
 
 ## ?.?.? / ????-??-??
 
+## 8.0.1 / 2022-04-03
+
+* Fixed resolving types starting with `namespace` keyword (examples 4 and
+  5 in https://www.php.net/manual/en/language.namespaces.nsconstants.php)
+  (@thekid)
+
 ## 8.0.0 / 2022-01-07
 
 This major release promotes annotations and comments to *Node* subclasses,

src/main/php/lang/ast/Scope.class.php

@@ -72,6 +72,8 @@ public function resolve($name) {
       return $name;
     } else if (isset($this->imports[$name])) {
       return $this->imports[$name];
+    } else if (0 === strncmp($name, 'namespace\\', 10)) {
+      return $this->package.'\\'.substr($name, 10);
     } else if ($this->package) {
       return $this->package.'\\'.$name;
     } else if ($this->parent) {

src/test/php/lang/ast/unittest/ScopeTest.class.php

@@ -83,4 +83,19 @@ public function resolve_global() {
     Assert::equals('\\Traversable', $s->resolve('Traversable'));
   }
 
+  #[Test]
+  public function resolve_namespace_keyword() {
+    $s= new Scope();
+    $s->package('test');
+
+    Assert::equals('\\test\\Date', $s->resolve('namespace\\Date'));
+  }
+
+  #[Test]
+  public function resolve_sub_namespace() {
+    $s= new Scope();
+    $s->package('test');
+
+    Assert::equals('\\test\\util\\Date', $s->resolve('namespace\\util\\Date'));
+  }
 }