use ++ everywhere

vlib/compiler/if_match.v

@@ -203,7 +203,7 @@ fn (p mut Parser) match_statement(is_expr bool) string {
 		i++
 		p.fgen_nl()
 	}
-	p.error('match expression requires `else`')
+	p.error('match must be exhaustive')
 	//p.returns = false // only get here when no default, so return is not guaranteed
 	return ''
 }

vlib/compiler/parser.v

@@ -1386,8 +1386,8 @@ fn ($v.name mut $v.typ) $p.cur_fn.name (...) {
 		}
 		else {
 			next := p.peek_token()
-			if next.tok == .number  && next.lit== '1' {
-				p.warn('use ++ instead of += 1')
+			if next.tok == .number && next.lit== '1' {
+				p.error('use `++` instead of `+= 1`')
 			}
 			p.gen(' += ')
 		}

vlib/compiler/tests/defer_test.v

@@ -16,7 +16,7 @@ fn test_defer() {
 }
 
 fn set_num(i int, n mut Num) {
-	defer { n.val+=1 }
+	defer { n.val++ }
 	println("Hi")
 	if i < 5 {
 		return

vlib/compiler/tests/mut_test.v

@@ -41,7 +41,8 @@ fn test_mut_2() {
 	b.a[zero].v << 5
 
 	b.a[0].v[zero] = 3
-	b.a[0].v[b.a[zero].v[zero]] += 1b.a[0].v[b.a[0].v[zero]] += 1
+	b.a[0].v[b.a[zero].v[zero]]++
+	b.a[0].v[b.a[0].v[zero]]++
 
 	assert b.a[0].v.len == 5
 	assert b.a[0].v[0] == 3

vlib/compiler/tests/pointers_test.v

@@ -3,7 +3,7 @@ fn test_pointer_arithmetic() {
 	arr := [1,2,3,4]
 	unsafe {
 		mut parr := *int(arr.data)
-		parr += 1
+		parr++
 		assert 2 == *parr
 		parr++
 		assert 3 == *parr