std/path: make globMatch work with @nogc (#9055)

Author: ljmf00-wekaio

std/path.d

@@ -3395,7 +3395,10 @@ do
     }
     else
     {
+        import core.memory : pureMalloc, pureFree;
         C[] pattmp;
+        scope(exit) if (pattmp !is null) (() @trusted => pureFree(pattmp.ptr))();
+
         for (size_t pi = 0; pi < pattern.length; pi++)
         {
             const pc = pattern[pi];
@@ -3481,9 +3484,12 @@ do
                              *   pattern[pi0 .. pi-1] ~ pattern[piRemain..$]
                              */
                             if (pattmp is null)
+                            {
                                 // Allocate this only once per function invocation.
-                                // Should do it with malloc/free, but that would make it impure.
-                                pattmp = new C[pattern.length];
+                                pattmp = (() @trusted =>
+                                    (cast(C*) pureMalloc(C.sizeof * pattern.length))[0 .. pattern.length])
+                                ();
+                            }
 
                             const len1 = pi - 1 - pi0;
                             pattmp[0 .. len1] = pattern[pi0 .. pi - 1];
@@ -3517,7 +3523,7 @@ do
 }
 
 ///
-@safe unittest
+@safe @nogc unittest
 {
     assert(globMatch("foo.bar", "*"));
     assert(globMatch("foo.bar", "*.*"));