cgen: fix for_in fixed_array of fixed_array literal (#9206)

vlib/v/gen/c/cgen.v

@@ -1403,8 +1403,15 @@ fn (mut g Gen) for_in_stmt(node ast.ForInStmt) {
 		}
 	} else if node.kind == .array_fixed {
 		mut cond_var := ''
-		needs_tmp_var := node.cond_type.is_ptr() || node.cond is ast.ArrayInit
+		cond_type_is_ptr := node.cond_type.is_ptr()
-		if needs_tmp_var {
+		cond_is_literal := node.cond is ast.ArrayInit
+		if cond_is_literal {
+			cond_var = g.new_tmp_var()
+			g.write(g.typ(node.cond_type))
+			g.write(' $cond_var = ')
+			g.expr(node.cond)
+			g.writeln(';')
+		} else if cond_type_is_ptr {
 			cond_var = g.new_tmp_var()
 			cond_var_type := g.typ(node.cond_type).trim('*')
 			if !node.cond.is_lvalue() {
@@ -1437,8 +1444,10 @@ fn (mut g Gen) for_in_stmt(node ast.ForInStmt) {
 			}
 			if !is_fixed_array {
 				addr := if node.val_is_mut { '&' } else { '' }
-				if needs_tmp_var {
+				if cond_type_is_ptr {
 					g.writeln(' = ${addr}(*$cond_var)[$idx];')
+				} else if cond_is_literal {
+					g.writeln(' = $addr$cond_var[$idx];')
 				} else {
 					g.write(' = $addr')
 					g.expr(node.cond)

vlib/v/tests/for_in_containers_of_fixed_array_test.v

@@ -50,6 +50,18 @@ fn test_for_mut_in_fixed_array_of_fixed_array() {
 	assert rets[2] == '[5, 6]'
 }
 
+fn test_for_in_fixed_array_of_fixed_array_literal() {
+	mut rets := []string{}
+
+	for pair in [[1, 2]!, [3, 4]!, [5, 6]!]! {
+		println(pair)
+		rets << '$pair'
+	}
+	assert rets[0] == '[1, 2]'
+	assert rets[1] == '[3, 4]'
+	assert rets[2] == '[5, 6]'
+}
+
 fn test_for_in_map_of_fixed_array() {
 	mut rets := []string{}
 	m := map{'aa': [1, 2]!, 'bb': [3, 4]!, 'cc': [5, 6]!}