@@ -434,7 +434,7 @@ impl Function {
434434/// [`Compiler::set_coverage_level`]: crate::chunk::Compiler::set_coverage_level
435435#[ cfg( any( feature ="luau" , doc) ) ]
436436#[ cfg_attr( docsrs, doc( cfg( feature ="luau" ) ) ) ]
437- pub fn coverage < F > ( & self , mut func : F )
437+ pub fn coverage < F > ( & self , func : F )
438438where
439439F : FnMut ( CoverageInfo ) ,
440440{
@@ -454,13 +454,16 @@ impl Function {
454454} else {
455455None
456456} ;
457- let rust_callback =& mut * ( dataas * mut F ) ;
458- rust_callback ( CoverageInfo {
459- function,
460- line_defined,
461- depth,
462- hits : slice:: from_raw_parts ( hits, size) . to_vec ( ) ,
463- } ) ;
457+ let rust_callback =& * ( dataas * const RefCell < F > ) ;
458+ if let Ok ( mut rust_callback) = rust_callback. try_borrow_mut ( ) {
459+ // Call the Rust callback with CoverageInfo
460+ rust_callback ( CoverageInfo {
461+ function,
462+ line_defined,
463+ depth,
464+ hits : slice:: from_raw_parts ( hits, size) . to_vec ( ) ,
465+ } ) ;
466+ }
464467}
465468
466469let lua =self . 0 . lua . lock ( ) ;
@@ -470,7 +473,8 @@ impl Function {
470473assert_stack ( state, 1 ) ;
471474
472475 lua. push_ref ( & self . 0 ) ;
473- let func_ptr =& mut funcas * mut F as * mut c_void ;
476+ let func =RefCell :: new ( func) ;
477+ let func_ptr =& funcas * const RefCell < F > as * mut c_void ;
474478 ffi:: lua_getcoverage ( state, -1 , func_ptr, callback :: < F > ) ;
475479}
476480}