diff --git a/src/eval.c b/src/eval.c
index 3ecbf65..b55ae1a 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -3794,8 +3794,8 @@
 			// This is recognized in compile_return().
 			if (ufunc->uf_ret_type->tt_type == VAR_VOID)
 			    ufunc->uf_ret_type = &t_unknown;
-			if (compile_def_function(ufunc,
-				     FALSE, COMPILE_TYPE(ufunc), NULL) == FAIL)
+			if (compile_def_function(ufunc, FALSE,
+					get_compile_type(ufunc), NULL) == FAIL)
 			{
 			    clear_tv(rettv);
 			    ret = FAIL;
diff --git a/src/proto/vim9compile.pro b/src/proto/vim9compile.pro
index 0e71b93..94ef827 100644
--- a/src/proto/vim9compile.pro
+++ b/src/proto/vim9compile.pro
@@ -23,6 +23,7 @@
 int compile_assign_lhs(char_u *var_start, lhs_T *lhs, int cmdidx, int is_decl, int heredoc, int oplen, cctx_T *cctx);
 int compile_load_lhs_with_index(lhs_T *lhs, char_u *var_start, cctx_T *cctx);
 int compile_assign_unlet(char_u *var_start, lhs_T *lhs, int is_assign, type_T *rhs_type, cctx_T *cctx);
+compiletype_T get_compile_type(ufunc_T *ufunc);
 int compile_def_function(ufunc_T *ufunc, int check_return_type, compiletype_T compile_type, cctx_T *outer_cctx);
 void set_function_type(ufunc_T *ufunc);
 void unlink_def_function(ufunc_T *ufunc);
diff --git a/src/version.c b/src/version.c
index 4dfbdd5..a68a662 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    4575,
+/**/
     4574,
 /**/
     4573,
diff --git a/src/vim.h b/src/vim.h
index 4f80a09..5f43ac7 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1839,20 +1839,6 @@
     CT_DEBUG	    // use df_instr_debug, overrules CT_PROFILE
 } compiletype_T;
 
-// Keep in sync with INSTRUCTIONS().
-#ifdef FEAT_PROFILE
-# define COMPILE_TYPE(ufunc) (debug_break_level > 0 \
-	|| may_break_in_function(ufunc) \
-		? CT_DEBUG \
-		: do_profiling == PROF_YES && (ufunc)->uf_profiling \
-			? CT_PROFILE : CT_NONE)
-#else
-# define COMPILE_TYPE(ufunc) debug_break_level > 0 \
-	|| may_break_in_function(ufunc) \
-		? CT_DEBUG \
-		: CT_NONE
-#endif
-
 /*
  * When compiling with 32 bit Perl time_t is 32 bits in the Perl code but 64
  * bits elsewhere.  That causes memory corruption.  Define time_T and use it
diff --git a/src/vim9.h b/src/vim9.h
index 03602e6..5fd8526 100644
--- a/src/vim9.h
+++ b/src/vim9.h
@@ -518,7 +518,7 @@
 // Used for "lnum" when a range is to be taken from the stack and "!" is used.
 #define LNUM_VARIABLE_RANGE_ABOVE -888
 
-// Keep in sync with COMPILE_TYPE()
+// Keep in sync with get_compile_type()
 #ifdef FEAT_PROFILE
 # define INSTRUCTIONS(dfunc) \
 	(debug_break_level > 0 || may_break_in_function(dfunc->df_ufunc) \
diff --git a/src/vim9compile.c b/src/vim9compile.c
index d8119c5..fa5f067 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -913,8 +913,7 @@
 	}
     }
 
-    update_has_breakpoint(ufunc);
-    compile_type = COMPILE_TYPE(ufunc);
+    compile_type = get_compile_type(ufunc);
 #ifdef FEAT_PROFILE
     // If the outer function is profiled, also compile the nested function for
     // profiling.
@@ -2475,6 +2474,30 @@
     return r;
 }
 
+/*
+ * Get the compilation type that should be used for "ufunc".
+ * Keep in sync with INSTRUCTIONS().
+ */
+    compiletype_T
+get_compile_type(ufunc_T *ufunc)
+{
+    // Update uf_has_breakpoint if needed.
+    update_has_breakpoint(ufunc);
+
+    if (debug_break_level > 0 || may_break_in_function(ufunc))
+	return CT_DEBUG;
+#ifdef FEAT_PROFILE
+    if (do_profiling == PROF_YES)
+    {
+	if (!ufunc->uf_profiling && has_profiling(FALSE, ufunc->uf_name, NULL))
+	    func_do_profile(ufunc);
+	if (ufunc->uf_profiling)
+	    return CT_PROFILE;
+    }
+#endif
+    return CT_NONE;
+}
+
 
 /*
  * Add a function to the list of :def functions.
diff --git a/src/vim9execute.c b/src/vim9execute.c
index 681847a..4d24eb9 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -284,6 +284,7 @@
     estack_T	*entry;
     funclocal_T	*floc = NULL;
     int		res = OK;
+    compiletype_T compile_type;
 
     if (dfunc->df_deleted)
     {
@@ -309,14 +310,12 @@
     }
 #endif
 
-    // Update uf_has_breakpoint if needed.
-    update_has_breakpoint(ufunc);
-
     // When debugging and using "cont" switches to the not-debugged
     // instructions, may need to still compile them.
-    if (func_needs_compiling(ufunc, COMPILE_TYPE(ufunc)))
+    compile_type = get_compile_type(ufunc);
+    if (func_needs_compiling(ufunc, compile_type))
     {
-	res = compile_def_function(ufunc, FALSE, COMPILE_TYPE(ufunc), NULL);
+	res = compile_def_function(ufunc, FALSE, compile_type, NULL);
 
 	// compile_def_function() may cause def_functions.ga_data to change
 	dfunc = ((dfunc_T *)def_functions.ga_data) + cdf_idx;
@@ -926,7 +925,7 @@
     int		error;
     int		idx;
     int		did_emsg_before = did_emsg;
-    compiletype_T compile_type = COMPILE_TYPE(ufunc);
+    compiletype_T compile_type = get_compile_type(ufunc);
 
     if (func_needs_compiling(ufunc, compile_type)
 		&& compile_def_function(ufunc, FALSE, compile_type, NULL)
@@ -4993,14 +4992,11 @@
 #undef STACK_TV_VAR
 #define STACK_TV_VAR(idx) (((typval_T *)ectx.ec_stack.ga_data) + ectx.ec_frame_idx + STACK_FRAME_SIZE + idx)
 
-    // Update uf_has_breakpoint if needed.
-    update_has_breakpoint(ufunc);
-
     if (ufunc->uf_def_status == UF_NOT_COMPILED
 	    || ufunc->uf_def_status == UF_COMPILE_ERROR
-	    || (func_needs_compiling(ufunc, COMPILE_TYPE(ufunc))
-		&& compile_def_function(ufunc, FALSE, COMPILE_TYPE(ufunc), NULL)
-								      == FAIL))
+	    || (func_needs_compiling(ufunc, get_compile_type(ufunc))
+		&& compile_def_function(ufunc, FALSE,
+				       get_compile_type(ufunc), NULL) == FAIL))
     {
 	if (did_emsg_cumul + did_emsg == did_emsg_before)
 	    semsg(_(e_function_is_not_compiled_str),
diff --git a/src/vim9expr.c b/src/vim9expr.c
index e2e4f8e..8276a77 100644
--- a/src/vim9expr.c
+++ b/src/vim9expr.c
@@ -355,15 +355,16 @@
 generate_funcref(cctx_T *cctx, char_u *name, int has_g_prefix)
 {
     ufunc_T *ufunc = find_func(name, FALSE);
+    compiletype_T compile_type;
 
     // Reject a global non-autoload function found without the "g:" prefix.
     if (ufunc == NULL || (!has_g_prefix && func_requires_g_prefix(ufunc)))
 	return FAIL;
 
     // Need to compile any default values to get the argument types.
-    if (func_needs_compiling(ufunc, COMPILE_TYPE(ufunc))
-	    && compile_def_function(ufunc, TRUE, COMPILE_TYPE(ufunc), NULL)
-								       == FAIL)
+    compile_type = get_compile_type(ufunc);
+    if (func_needs_compiling(ufunc, compile_type)
+	      && compile_def_function(ufunc, TRUE, compile_type, cctx) == FAIL)
 	return FAIL;
     return generate_PUSHFUNC(cctx, ufunc->uf_name, ufunc->uf_func_type);
 }
@@ -1007,12 +1008,14 @@
        )
 	compile_def_function(ufunc, FALSE, CT_NONE, cctx);
 
-    // if the outer function is not compiled for debugging, this one might be
-    if (cctx->ctx_compile_type != CT_DEBUG)
+    // if the outer function is not compiled for debugging or profiling, this
+    // one might be
+    if (cctx->ctx_compile_type == CT_NONE)
     {
-	update_has_breakpoint(ufunc);
-	if (COMPILE_TYPE(ufunc) == CT_DEBUG)
-	    compile_def_function(ufunc, FALSE, CT_DEBUG, cctx);
+	compiletype_T compile_type = get_compile_type(ufunc);
+
+	if (compile_type != CT_NONE)
+	    compile_def_function(ufunc, FALSE, compile_type, cctx);
     }
 
     // The last entry in evalarg.eval_tofree_ga is a copy of the last line and
diff --git a/src/vim9instr.c b/src/vim9instr.c
index 9b176df..de144dc 100644
--- a/src/vim9instr.c
+++ b/src/vim9instr.c
@@ -1207,8 +1207,10 @@
     cctx->ctx_has_closure = 1;
 
     // If the referenced function is a closure, it may use items further up in
-    // the nested context, including this one.
-    if (ufunc->uf_flags & FC_CLOSURE)
+    // the nested context, including this one.  But not a function defined at
+    // the script level.
+    if ((ufunc->uf_flags & FC_CLOSURE)
+			       && func_name_refcount(cctx->ctx_ufunc->uf_name))
 	cctx->ctx_ufunc->uf_flags |= FC_CLOSURE;
 
     type = ufunc->uf_func_type == NULL ? &t_func_any : ufunc->uf_func_type;
@@ -1487,6 +1489,7 @@
 	    && ufunc->uf_def_status != UF_COMPILE_ERROR)
     {
 	int		i;
+	compiletype_T	compile_type;
 
 	for (i = 0; i < argcount; ++i)
 	{
@@ -1519,9 +1522,10 @@
 		return FAIL;
 	    }
 	}
-	if (func_needs_compiling(ufunc, COMPILE_TYPE(ufunc))
+	compile_type = get_compile_type(ufunc);
+	if (func_needs_compiling(ufunc, compile_type)
 		&& compile_def_function(ufunc, ufunc->uf_ret_type == NULL,
-					    COMPILE_TYPE(ufunc), NULL) == FAIL)
+						   compile_type, NULL) == FAIL)
 	    return FAIL;
     }
     if (ufunc->uf_def_status == UF_COMPILE_ERROR)