compiler: enforce reserved keywords replacement

* compiler: Enforce reserved keywords replacement on empty value initialization

* compiler: Add test for reserved keywords enforcement

A new struct has been introduced in the tests that contains all C reserved keywords that are not reserved in V. Some read and write are tested too.

compiler/parser.v

@@ -3029,9 +3029,10 @@ fn (p mut Parser) struct_init(typ string) string {
 		}
 		// Zero values: init all fields (ints to 0, strings to '' etc)
 		for i, field in t.fields {
+			sanitized_name := if typ != 'Option' { p.table.var_cgen_name( field.name ) } else { field.name }
 			// println('### field.name')
 			// Skip if this field has already been assigned to
-			if field.name in inited_fields {
+			if sanitized_name in inited_fields {
 				continue
 			}
 			field_typ := field.typ
@@ -3040,9 +3041,9 @@ fn (p mut Parser) struct_init(typ string) string {
 			}
 			// init map fields
 			if field_typ.starts_with('map_') {
-				p.gen_struct_field_init(field.name)
+				p.gen_struct_field_init(sanitized_name)
 				p.gen_empty_map(field_typ.right(4))
-				inited_fields << field.name
+				inited_fields << sanitized_name
 				if i != t.fields.len - 1 {
 					p.gen(',')
 				}
@@ -3051,7 +3052,7 @@ fn (p mut Parser) struct_init(typ string) string {
 			}
 			def_val := type_default(field_typ)
 			if def_val != '' && def_val != '{0}' {
-				p.gen_struct_field_init(field.name)
+				p.gen_struct_field_init(sanitized_name)
 				p.gen(def_val)
 				if i != t.fields.len - 1 {
 					p.gen(',')

compiler/tests/struct_test.v

@@ -1,65 +1,109 @@
 struct A{
-mut: 
-	val int 
-	nums []int 
-} 
+mut:
+	val int
+	nums []int
+}
 
 struct B{
-mut: 
-	a A 
-} 
+mut:
+	a A
+}
 
 struct C {
-mut: 
-	b B 
-	nums []int 
-	aarr []A 
-	num int 
-} 
+mut:
+	b B
+	nums []int
+	aarr []A
+	num int
+}
 
 struct User {
 	name string
-	age int 
-} 
+	age int
+}
 
 struct Foo {
-	@type string 
-} 
- 
-fn test_struct_levels() { 
-	mut c := C{} 
-	assert c.nums.len == 0 
-	c.nums << 3 
-	assert c.nums.len == 1 
-	assert c.nums[0] == 3 
-	c.nums[0] = 4 
-	assert c.nums[0] == 4 
-	c.b.a.val = 34 
-	assert c.b.a.val == 34 
+	@type string
+}
+
+//We need to make sure that this compiles with all the reserved names.
+struct ReservedKeywords {
+	delete   int
+	exit     int
+	unix     int
+	error    int
+	malloc   int
+	calloc   int
+	free     int
+	panic    int
+	auto     int
+	char     int
+	do       int
+	double   int
+	extern   int
+	float    int
+	inline   int
+	long     int
+	register int
+	restrict int
+	short    int
+	signed   int
+	typedef  int
+	unsigned int
+	void     int
+	volatile int
+	while    int
+}
+
+fn test_struct_levels() {
+	mut c := C{}
+	assert c.nums.len == 0
+	c.nums << 3
+	assert c.nums.len == 1
+	assert c.nums[0] == 3
+	c.nums[0] = 4
+	assert c.nums[0] == 4
+	c.b.a.val = 34
+	assert c.b.a.val == 34
 	c.b.a.nums = [0].repeat(0)
-	c.b.a.nums << 0 
-	c.b.a.nums << 2 
-	assert c.b.a.nums.len == 2 
-	assert c.b.a.nums[0] == 0 
-	assert c.b.a.nums[1] == 2 
-	c.b.a.nums [0] = 7 
-	assert c.b.a.nums[0] == 7 
-	c.aarr << A{val:8} 
-	assert c.aarr.len == 1 
-	assert c.aarr[0].val == 8 
-	c.num = 20 
-	assert c.num == 20 
-	c.aarr[0].val  = 10 
-	assert c.aarr[0].val == 10 
-} 
+	c.b.a.nums << 0
+	c.b.a.nums << 2
+	assert c.b.a.nums.len == 2
+	assert c.b.a.nums[0] == 0
+	assert c.b.a.nums[1] == 2
+	c.b.a.nums [0] = 7
+	assert c.b.a.nums[0] == 7
+	c.aarr << A{val:8}
+	assert c.aarr.len == 1
+	assert c.aarr[0].val == 8
+	c.num = 20
+	assert c.num == 20
+	c.aarr[0].val  = 10
+	assert c.aarr[0].val == 10
+}
 
 fn test_struct_str() {
-	u := User{'Bob', 30} 
-	println(u)  // make sure the struct is printable 
-	// assert u.str() == '{name:"Bob", age:30}'  // TODO 
-} 
+	u := User{'Bob', 30}
+	println(u)  // make sure the struct is printable
+	// assert u.str() == '{name:"Bob", age:30}'  // TODO
+}
 
 fn test_at() {
-	foo := Foo{ @type: 'test' } 
-	println(foo.@type) 
-} 
+	foo := Foo{ @type: 'test' }
+	println(foo.@type)
+}
+
+fn test_reserved_keywords() {
+	//Make sure we can initialize them correctly using full syntax.
+	rk_holder := ReservedKeywords{0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3}
+	//Test a few as it'll take too long to test all. If it's initialized
+	//correctly, other fields are also probably valid.
+	assert rk_holder.unix == 5
+	assert rk_holder.while == 3
+
+	rk_holder2 := ReservedKeywords{inline: 9, volatile: 11}
+	//Make sure partial initialization works too.
+	assert rk_holder2.inline == 9
+	assert rk_holder2.volatile == 11
+	assert rk_holder2.while == 0 //Zero value as not specified.
+}