checker: more default field fixes

vlib/io/util/util.v

@@ -11,7 +11,7 @@ const (
 
 pub struct TempFileOptions {
 	path    string = os.temp_dir()
-	pattern string = ''
+	pattern string
 }
 
 // temp_file returns an uniquely named, open, writable, `os.File` and it's path
@@ -49,7 +49,7 @@ pub fn temp_file(tfo TempFileOptions) ?(os.File, string) {
 
 pub struct TempDirOptions {
 	path    string = os.temp_dir()
-	pattern string = ''
+	pattern string
 }
 
 // temp_dir returns an uniquely named, writable, directory path

vlib/net/html/data_structures.v

@@ -5,7 +5,7 @@ struct Stack {
 	null_element int = C.INT_MIN
 mut:
 	elements     []int
-	size         int = 0
+	size         int
 }
 
 fn (stack Stack) is_null(data int) bool {
@@ -44,7 +44,7 @@ fn (mut stack Stack) push(item int) {
 struct BTree {
 mut:
 	all_tags     []Tag
-	node_pointer int = 0
+	node_pointer int
 	childrens    [][]int
 	parents      []int
 }

vlib/net/html/parser.v

@@ -7,11 +7,11 @@ mut:
 	current_tag      &Tag
 	open_tag         bool = false
 	open_code        bool = false
-	open_string      int = 0
+	open_string      int
 	open_comment     bool = false
 	is_attribute     bool = false
-	opened_code_type string = ''
-	line_count       int = 0
+	opened_code_type string
+	line_count       int
 	lexeme_builder   string
 	code_tags        map[string]bool = {
 		'script': true

vlib/net/html/tag.v

@@ -15,7 +15,7 @@ mut:
 	attributes         map[string]string // attributes will be like map[name]value
 	last_attribute     string
 	parent             &Tag = C.NULL
-	position_in_parent int = 0
+	position_in_parent int
 	closed             bool = false
 	close_type         CloseTagType = .in_name
 }

vlib/rand/mt19937/mt19937.v

@@ -13,7 +13,7 @@ C++ functions for MT19937, with initialization improved 2002/2/10.
    Matthe Bellew's simplification, Isaku Wada's real version.
 
    Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
-   All rights reserved.                          
+   All rights reserved.
 
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
@@ -26,8 +26,8 @@ C++ functions for MT19937, with initialization improved 2002/2/10.
         notice, this list of conditions and the following disclaimer in the
         documentation and/or other materials provided with the distribution.
 
-     3. The names of its contributors may not be used to endorse or promote 
-        products derived from this software without specific prior written 
+     3. The names of its contributors may not be used to endorse or promote
+        products derived from this software without specific prior written
         permission.
 
    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
@@ -61,7 +61,7 @@ pub struct MT19937RNG {
 mut:
 	state    []u64 = calculate_state(util.time_seed_array(2), mut []u64{len: nn})
 	mti      int = nn
-	next_rnd u32 = 0
+	next_rnd u32
 	has_next bool = false
 }
 

vlib/regex/regex.v

@@ -302,15 +302,15 @@ pub mut:
 
 	// char classes storage
 	cc []CharClass             // char class list
-	cc_index int         = 0   // index
+	cc_index int               // index
 
 	// state index
 	state_stack_index int= -1
 	state_stack []StateDotObj
 
 
 	// groups
-	group_count int      = 0   // number of groups in this regex struct
+	group_count int        // number of groups in this regex struct
 	groups []int               // groups index results
 	group_max_nested int = 3   // max nested group
 	group_max int        = 8   // max allowed number of different groups
@@ -321,10 +321,10 @@ pub mut:
 	group_map map[string]int   // groups names map
 
 	// flags
-	flag int             = 0   // flag for optional parameters
+	flag int                   // flag for optional parameters
 
 	// Debug/log
-	debug int            = 0           // enable in order to have the unroll of the code 0 = NO_DEBUG, 1 = LIGHT 2 = VERBOSE
+	debug int                          // enable in order to have the unroll of the code 0 = NO_DEBUG, 1 = LIGHT 2 = VERBOSE
 	log_func FnLog       = simple_log  // log function, can be customized by the user
 	query string         = ""          // query string
 }

vlib/regex/regex_test.v

@@ -8,8 +8,8 @@ import regex
 struct TestItem {
 	src string
 	q string
-	s int = 0
-	e int = 0
+	s int
+	e int
 }
 
 const(
@@ -239,7 +239,7 @@ fn test_regex(){
 		if res.len != to.r.len {
 			println("ERROR: find_all, array of different size.")
 			assert false
-			continue            
+			continue
 		}
 
 		for c1,i in res {
@@ -268,7 +268,7 @@ fn test_regex(){
 			println("ERROR: replace.")
 			assert false
 			continue
-		}		
+		}
 	}
 
 	// check match and find
@@ -282,7 +282,7 @@ fn test_regex(){
 				eprintln('err: $err')
 				assert false
 				continue
-			}                
+			}
 			// q_str := re.get_query()
 			// println("Query: $q_str")
 			start,end := re.find(to.src)

vlib/sync/atomic2/atomic_test.v

@@ -7,7 +7,7 @@ const (
 
 struct Counter {
 mut:
-	counter u64 = 0    
+	counter u64
 }
 
 // without proper syncronization this would fail

vlib/v/util/vtest/vtest.v

@@ -3,7 +3,7 @@ module vtest
 import os
 
 pub struct FilterVTestConfig {
-	basepath    string = ''
+	basepath    string
 	fix_slashes bool = true
 }
 

vlib/vweb/tests/vweb_test.v

@@ -230,8 +230,8 @@ struct SimpleTcpClientConfig {
 	host    string = 'static.dev'
 	path    string = '/'
 	agent   string = 'v/net.tcp.v'
-	headers string = ''
-	content string = ''
+	headers string
+	content string
 }
 
 fn simple_tcp_client(config SimpleTcpClientConfig) ?string {