Add test cases for conflicting use and definition in same ns (stas)

Zend/tests/use_const/define_imported.phpt

@@ -0,0 +1,14 @@
+--TEST--
+defining const with same name as imported should fail
+--FILE--
+<?php
+
+namespace {
+    use const foo\bar;
+
+    const bar = 42;
+}
+
+?>
+--EXPECTF--
+Fatal error: Cannot declare const bar because the name is already in use in %s on line %d

Zend/tests/use_const/define_imported_before.phpt

@@ -0,0 +1,14 @@
+--TEST--
+using const with same name as defined should fail
+--FILE--
+<?php
+
+namespace {
+    const bar = 42;
+
+    use const foo\bar;
+}
+
+?>
+--EXPECTF--
+Fatal error: Cannot use const foo\bar as bar because the name is already in use in %s on line %d

Zend/tests/use_const/shadow_global_same_ns.phpt

@@ -1,21 +0,0 @@
---TEST--
-shadowing global constants defined in the same namespace as use
---FILE--
-<?php
-
-namespace foo {
-    const bar = 'local';
-}
-
-namespace {
-    const bar = 'global';
-
-    use const foo\bar;
-    var_dump(bar);
-    echo "Done\n";
-}
-
-?>
---EXPECT--
-string(5) "local"
-Done

Zend/tests/use_function/define_imported.phpt

@@ -0,0 +1,14 @@
+--TEST--
+defining function with same name as imported should fail
+--FILE--
+<?php
+
+namespace {
+    use function foo\bar;
+
+    function bar() {}
+}
+
+?>
+--EXPECTF--
+Fatal error: Cannot declare function bar because the name is already in use in %s on line %d

Zend/tests/use_function/define_imported_before.phpt

@@ -0,0 +1,14 @@
+--TEST--
+using function with same name as defined should fail
+--FILE--
+<?php
+
+namespace {
+    function bar() {}
+
+    use function foo\bar;
+}
+
+?>
+--EXPECTF--
+Fatal error: Cannot use function foo\bar as bar because the name is already in use in %s on line %d

Zend/tests/use_function/shadow_global_same_ns.phpt

@@ -1,25 +0,0 @@
---TEST--
-shadowing global functions defined in the same namespace as use
---FILE--
-<?php
-
-namespace foo {
-    function bar() {
-        return 'local';
-    }
-}
-
-namespace {
-    function bar() {
-        return 'global';
-    }
-
-    use function foo\bar;
-    var_dump(bar());
-    echo "Done\n";
-}
-
-?>
---EXPECT--
-string(5) "local"
-Done