code: function guardTextInMixins() {
        for (const { mixin, code, tag } of deferred) {
          if (calledInSensitiveContext.has(mixin)) {
            const guards = calledInSensitiveContext.get(mixin);
            if (code) {
              for (const guard of guards) {
                code.val = addGuard(guard, code.val);
                code.mustEscape = false;
              }
            } else if (guards.has(trustedScriptGuard)) {
              distrust(
                `HTML tag <${ tag.name
                }> may appear inside <script> which cannot have tag content via call to +${ mixin }`,
                tag);
            }
          } else if (code) {
            code.val = addGuard(trustedHTMLGuard, code.val);
            code.mustEscape = false;
          }
        }
      }
docs: Worst case analysis!  If a code block appears in the top level of a mixin body, and that body is called from the top level of a <script> element, then guard the code. This may affect uses of the mixin from outside script elements.