Merge pull request #2791 from RazvanN7/Rename_var

Rename foreach variable to get rid of shadowing
merged-on-behalf-of: Nicholas Wilson <thewilsonator@users.noreply.github.com>

Author: dlang-bot

src/core/internal/utf.d

@@ -651,9 +651,9 @@ string toUTF8(const scope wchar[] s)
         else
         {
             r.length = i;
-            foreach (dchar c; s[i .. slen])
+            foreach (dchar ch; s[i .. slen])
             {
-                encode(r, c);
+                encode(r, ch);
             }
             break;
         }