[10.x] Fix use statement compilation in Blade templates (#49479)

* Fix use statement compilation in Blade templates

* added one more failing test

* fix

* fix typo

Author: MrPunyapal

src/Illuminate/View/Compilers/Concerns/CompilesUseStatements.php

@@ -14,7 +14,7 @@ protected function compileUse($expression)
     {
         $segments = explode(',', preg_replace("/[\(\)]/", '', $expression));
 
-        $use = trim($segments[0], " '\"");
+        $use = ltrim(trim($segments[0], " '\""), '\\');
         $as = isset($segments[1]) ? ' as '.trim($segments[1], " '\"") : '';
 
         return "<?php use \\{$use}{$as}; ?>";

tests/View/Blade/BladeUseTest.php

@@ -17,4 +17,18 @@ public function testUseStatementsWithoutAsAreCompiled()
         $expected = "Foo <?php use \SomeNamespace\SomeClass; ?> bar";
         $this->assertEquals($expected, $this->compiler->compileString($string));
     }
+
+    public function testUseStatementsWithBackslashAtBeginningAreCompiled()
+    {
+        $string = "Foo @use('\SomeNamespace\SomeClass') bar";
+        $expected = "Foo <?php use \SomeNamespace\SomeClass; ?> bar";
+        $this->assertEquals($expected, $this->compiler->compileString($string));
+    }
+
+    public function testUseStatementsWithBackslashAtBeginningAndAliasedAreCompiled()
+    {
+        $string = "Foo @use('\SomeNamespace\SomeClass', 'Foo') bar";
+        $expected = "Foo <?php use \SomeNamespace\SomeClass as Foo; ?> bar";
+        $this->assertEquals($expected, $this->compiler->compileString($string));
+    }
 }