cgen: fix error for map get anon fn value (#13782)

vlib/v/gen/c/cgen.v

@@ -955,7 +955,13 @@ fn (mut g Gen) optional_type_name(t ast.Type) (string, string) {
 
 fn (g Gen) optional_type_text(styp string, base string) string {
 	// replace void with something else
-	size := if base == 'void' { 'byte' } else { base }
+	size := if base == 'void' {
+		'byte'
+	} else if base.starts_with('anon_fn') {
+		'void*'
+	} else {
+		base
+	}
 	ret := 'struct $styp {
 	byte state;
 	IError err;
@@ -4826,12 +4832,15 @@ fn (mut g Gen) insert_at(pos int, s string) {
 // Returns the type of the last stmt
 fn (mut g Gen) or_block(var_name string, or_block ast.OrExpr, return_type ast.Type) {
 	cvar_name := c_name(var_name)
-	mr_styp := g.base_type(return_type)
+	mut mr_styp := g.base_type(return_type)
 	is_none_ok := return_type == ast.ovoid_type
 	g.writeln(';')
 	if is_none_ok {
 		g.writeln('if (${cvar_name}.state != 0 && ${cvar_name}.err._typ != _IError_None___index) {')
 	} else {
+		if return_type != 0 && g.table.sym(return_type).kind == .function {
+			mr_styp = 'voidptr'
+		}
 		g.writeln('if (${cvar_name}.state != 0) { /*or block*/ ')
 	}
 	if or_block.kind == .block {

vlib/v/gen/c/index.v

@@ -365,8 +365,11 @@ fn (mut g Gen) index_of_map(node ast.IndexExpr, sym ast.TypeSymbol) {
 	info := sym.info as ast.Map
 	key_type_str := g.typ(info.key_type)
 	elem_type := info.value_type
-	elem_type_str := g.typ(elem_type)
+	mut elem_type_str := g.typ(elem_type)
 	elem_typ := g.table.sym(elem_type)
+	if elem_typ.kind == .function {
+		elem_type_str = 'voidptr'
+	}
 	get_and_set_types := elem_typ.kind in [.struct_, .map]
 	if g.is_assign_lhs && !g.is_arraymap_set && !get_and_set_types {
 		if g.assign_op == .assign || info.value_type == ast.string_type {
@@ -401,12 +404,8 @@ fn (mut g Gen) index_of_map(node ast.IndexExpr, sym ast.TypeSymbol) {
 		g.is_arraymap_set = old_is_arraymap_set
 		g.is_assign_lhs = old_is_assign_lhs
 		g.write('}')
-		if elem_typ.kind == .function {
-			g.write(', &(voidptr[]) { ')
-		} else {
 		g.arraymap_set_pos = g.out.len
 		g.write(', &($elem_type_str[]) { ')
-		}
 		if g.assign_op != .assign && info.value_type != ast.string_type {
 			zero := g.type_default(info.value_type)
 			g.write('$zero })))')
@@ -450,8 +449,6 @@ fn (mut g Gen) index_of_map(node ast.IndexExpr, sym ast.TypeSymbol) {
 					g.write_fn_ptr_decl(&elem_typ.info, '')
 					g.write(')(*(voidptr*)map_get(')
 				}
-			} else if elem_typ.kind == .function {
-				g.write('(*(voidptr*)map_get(')
 			} else {
 				g.write('(*($elem_type_str*)map_get(')
 			}
@@ -477,8 +474,6 @@ fn (mut g Gen) index_of_map(node ast.IndexExpr, sym ast.TypeSymbol) {
 			g.write('))')
 		} else if g.is_fn_index_call {
 			g.write(', &(voidptr[]){ $zero })))')
-		} else if elem_typ.kind == .function {
-			g.write(', &(voidptr[]){ $zero }))')
 		} else {
 			g.write(', &($elem_type_str[]){ $zero }))')
 		}

vlib/v/tests/map_get_anon_fn_value_test.v

@@ -0,0 +1,25 @@
+const numbers = {
+	'one': fn () int {
+		return 1
+	}
+}
+
+fn test_map_get_anon_fn_value() {
+	num1 := numbers['one'] or {
+		fn () int {
+			return 2
+		}
+	}
+	ret1 := num1()
+	println(ret1)
+	assert ret1 == 1
+
+	num2 := numbers['two'] or {
+		fn () int {
+			return 2
+		}
+	}
+	ret2 := num2()
+	println(ret2)
+	assert ret2 == 2
+}