--- core/fxcrt/cfx_read_only_container_stream.h	2026-02-27 12:34:05.172587036 +0100
+++ core/fxcrt/cfx_read_only_container_stream.h	2026-02-27 12:34:22.968580294 +0100
@@ -35,19 +35,18 @@
   CONSTRUCT_VIA_MAKE_RETAIN;

  private:
-  explicit CFX_ReadOnlyContainerStream(Container data)
-    requires(HasPtrSpanMethod<Container>)
-      : CFX_ReadOnlySpanStream(pdfium::as_bytes(data->span())),
-        data_(std::move(data)) {}
-
-  explicit CFX_ReadOnlyContainerStream(Container data)
-    requires(HasSpanMethod<Container>)
-      : CFX_ReadOnlySpanStream(pdfium::as_bytes(data.span())),
-        data_(std::move(data)) {}
+  static pdfium::span<const uint8_t> GetSpanFromData(const Container& data) {
+    if constexpr (HasPtrSpanMethod<Container>) {
+      return pdfium::as_bytes(data->span());
+    } else if constexpr (HasSpanMethod<Container>) {
+      return pdfium::as_bytes(data.span());
+    } else {
+      return pdfium::as_byte_span(data);
+    }
+  }

   explicit CFX_ReadOnlyContainerStream(Container data)
-    requires(!HasSpanMethod<Container> && !HasPtrSpanMethod<Container>)
-      : CFX_ReadOnlySpanStream(pdfium::as_byte_span(data)),
+      : CFX_ReadOnlySpanStream(GetSpanFromData(data)),
         data_(std::move(data)) {}

   ~CFX_ReadOnlyContainerStream() override {