fmt: assert (a == b) -> assert a == b (#8351)

vlib/builtin/array_test.v

@@ -715,17 +715,17 @@ fn test_sort() {
 	//
 	mut users := [User{22, 'Peter'}, User{20, 'Bob'}, User{25, 'Alice'}]
 	users.sort(a.age < b.age)
-	assert (users[0].age == 20)
+	assert users[0].age == 20
-	assert (users[1].age == 22)
+	assert users[1].age == 22
-	assert (users[2].age == 25)
+	assert users[2].age == 25
-	assert (users[0].name == 'Bob')
+	assert users[0].name == 'Bob'
-	assert (users[1].name == 'Peter')
+	assert users[1].name == 'Peter'
-	assert (users[2].name == 'Alice')
+	assert users[2].name == 'Alice'
 	//
 	users.sort(a.age > b.age)
-	assert (users[0].age == 25)
+	assert users[0].age == 25
-	assert (users[1].age == 22)
+	assert users[1].age == 22
-	assert (users[2].age == 20)
+	assert users[2].age == 20
 	//
 	users.sort(a.name < b.name) // Test sorting by string fields
 	// assert users.map(it.name).join(' ') == 'Alice Bob Peter'

vlib/v/fmt/fmt.v

@@ -2209,6 +2209,14 @@ pub fn (mut f Fmt) assign_stmt(node ast.AssignStmt) {
 
 pub fn (mut f Fmt) assert_stmt(node ast.AssertStmt) {
 	f.write('assert ')
+	if node.expr is ast.ParExpr {
+		if node.expr.expr is ast.InfixExpr {
+			infix := node.expr.expr
+			f.expr(infix)
+			f.writeln('')
+			return
+		}
+	}
 	f.expr(node.expr)
 	f.writeln('')
 }

vlib/v/fmt/tests/asserts_expected.vv

@@ -0,0 +1,5 @@
+fn f() {
+	assert 0 == 0
+	assert 0 < 1
+	assert (1 + 2) == 3
+}

vlib/v/fmt/tests/asserts_input.vv

@@ -0,0 +1,5 @@
+fn f() {
+	assert (0 == 0)
+	assert (0 < 1)
+	assert ((1 + 2) == 3)
+}