fmt: fix formatting backtick char literal

vlib/v/fmt/fmt.v

@@ -40,15 +40,11 @@ pub fn fmt(file ast.File, table &table.Table) string {
 	}
 	f.cur_mod = 'main'
 	for stmt in file.stmts {
-		// TODO `if stmt is ast.Import`
-		match stmt {
-			ast.Import {
+		if stmt is ast.Import {
 			// Just remember the position of the imports for now
 			f.import_pos = f.out.len
 			// f.imports(f.file.imports)
 		}
-			else {}
-		}
 		f.stmt(stmt)
 	}
 	// for comment in file.comments { println('$comment.line_nr $comment.text')	}

vlib/v/fmt/tests/char_literal_backtick_keep.vv

@@ -0,0 +1,3 @@
+fn char_backtick() {
+	`\``
+}

vlib/v/fmt/tests/functions_expected.vv

@@ -5,7 +5,7 @@ fn fn_variadic(arg int, args ...string) {
 }
 
 fn fn_with_assign_stmts() {
-	a, b := fn_with_multi_return()
+	_, _ := fn_with_multi_return()
 }
 
 fn fn_with_multi_return() (int, string) {

vlib/v/fmt/tests/functions_input.vv

@@ -5,7 +5,7 @@ fn fn_variadic(arg int, args... string) {
 }
 
 fn fn_with_assign_stmts() {
-	a,b := fn_with_multi_return()
+	_,_ := fn_with_multi_return()
 }
 
 fn fn_with_multi_return() (int,string) {

vlib/v/fmt/tests/loops_expected.vv

@@ -6,6 +6,7 @@ fn for_in_loop() {
 
 fn for_in_loop_with_counter() {
 	for i, item in arr {
+		println(i)
 		println(item)
 	}
 }

vlib/v/fmt/tests/loops_input.vv

@@ -6,6 +6,7 @@ fn for_in_loop() {
 
 fn for_in_loop_with_counter() {
 	for i, item in arr {
+		println(i)
 		println(item)
 	}
 }

vlib/v/scanner/scanner.v

@@ -929,9 +929,6 @@ fn (s mut Scanner) ident_char() string {
 			s.error('invalid character literal (more than one character)\n' + 'use quotes for strings, backticks for characters')
 		}
 	}
-	if c == '\\`' {
-		return '`'
-	}
 	// Escapes a `'` character
 	return if c == "\'" { '\\' + c } else { c }
 }