diff --git a/vlib/compiler/if_match.v b/vlib/compiler/if_match.v
index a45e736e81..61f2eb7ff8 100644
--- a/vlib/compiler/if_match.v
+++ b/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 ''
 }
diff --git a/vlib/compiler/parser.v b/vlib/compiler/parser.v
index 3b970c511f..f102fb85b8 100644
--- a/vlib/compiler/parser.v
+++ b/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(' += ')
 		}
diff --git a/vlib/compiler/tests/defer_test.v b/vlib/compiler/tests/defer_test.v
index c2e71900d3..b64292a86b 100644
--- a/vlib/compiler/tests/defer_test.v
+++ b/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
diff --git a/vlib/compiler/tests/mut_test.v b/vlib/compiler/tests/mut_test.v
index 9be62a3e1d..8b039ffc7c 100644
--- a/vlib/compiler/tests/mut_test.v
+++ b/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
diff --git a/vlib/compiler/tests/pointers_test.v b/vlib/compiler/tests/pointers_test.v
index 8c3993b7fa..b3fb8e40ad 100644
--- a/vlib/compiler/tests/pointers_test.v
+++ b/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
diff --git a/vlib/sdl/examples/tvintris/tvintris.v b/vlib/sdl/examples/tvintris/tvintris.v
index 279d7547c1..403235bb27 100644
--- a/vlib/sdl/examples/tvintris/tvintris.v
+++ b/vlib/sdl/examples/tvintris/tvintris.v
@@ -299,7 +299,7 @@ fn main() {
 //	println('JOY2 id=${game2.joy_id}')
 
 	// delay uses milliseconds so 1000 ms / 30 frames (30fps) roughly = 33.3333 ms/frame
-	time_per_frame := 1000.0 / 30.0 
+	time_per_frame := 1000.0 / 30.0
 
 	game.k_fire = P1FIRE
 	game.k_up = P1UP
@@ -339,7 +339,7 @@ fn main() {
 	mut total_frames := u32(0)
 
 	for {
-		total_frames += 1
+		total_frames++
 		start_ticks := sdl.get_perf_counter()
 
 		g1 := game
@@ -405,13 +405,13 @@ fn main() {
 			break
 		}
 		end_ticks := sdl.get_perf_counter()
-		
+
 		total_frame_ticks += end_ticks-start_ticks
 		elapsed_time := f64(end_ticks - start_ticks) / f64(sdl.get_perf_frequency())
 		// current_fps := 1.0 / elapsed_time
-		
+
 		// should limit system to (1 / time_per_frame) fps
-		sdl.delay(u32(math.floor(time_per_frame - elapsed_time)))  
+		sdl.delay(u32(math.floor(time_per_frame - elapsed_time)))
 	}
 	if game.font != voidptr(0) {
 		C.TTF_CloseFont(game.font)
diff --git a/vlib/strings/builder_js.v b/vlib/strings/builder_js.v
index 936b01d5e4..1c2ac55d95 100644
--- a/vlib/strings/builder_js.v
+++ b/vlib/strings/builder_js.v
@@ -19,7 +19,7 @@ pub fn new_builder(initial_size int) Builder {
 
 pub fn (b mut Builder) write_b(data byte) {
 	b.buf << data
-	b.len += 1
+	b.len++
 }
 
 pub fn (b mut Builder) write(s string) {
diff --git a/vlib/strings/builder_test.v b/vlib/strings/builder_test.v
index cb81f51c1c..0e48a01574 100644
--- a/vlib/strings/builder_test.v
+++ b/vlib/strings/builder_test.v
@@ -25,7 +25,7 @@ fn test_big_sb() {
 	for i in 0..n {
 		sb.writeln(i.str())
 		sb2.write('+')
-	}	
+	}
 	s := sb.str()
 	lines := s.split_into_lines()
 	assert lines.len == n
@@ -35,8 +35,8 @@ fn test_big_sb() {
 	assert lines[98765] == '98765'
 	println(sb2.len)
 	assert sb2.len == n
-	
-}	
+
+}
 
 fn test_byte_write() {
 	mut sb := strings.new_builder(100)
@@ -44,7 +44,7 @@ fn test_byte_write() {
 	mut count := 0
 	for word in temp_str {
 		sb.write_b(word)
-		count += 1
+		count++
 		assert count == sb.len
 	}
 	assert sb.str() == temp_str