add a fmt test for it

vlib/v/fmt/tests/struct_decl_with_const_default_value_and_comments_keep.vv

@@ -0,0 +1,34 @@
+module foo
+
+pub const endline_cr_len = 1
+
+pub struct RandomAccessReader {
+pub mut:
+	index i64
+
+	start_index i64
+	end_index   i64 = -1
+
+	end_line      u8  = `\n`
+	end_line_len  int = foo.endline_cr_len // size of the endline rune \n = 1, \r\n = 2
+	separator     u8  = `,`                // comma is the default separator
+	separator_len int = 1                  // size of the separator rune
+	quote         u8  = `"`                // double quote is the standard quote char
+	quote_remove  bool // if true clear the cell from the quotes
+	comment       u8 = `#` // every line that start with the quote char is ignored
+
+	default_cell string = '*' // return this string if out of the csv boundaries
+	empty_cell   string = '#' // retunrn this if empty cell
+	// ram buffer
+	mem_buf_type  u32     // buffer type 0=File,1=RAM
+	mem_buf       voidptr // buffer used to load chars from file
+	mem_buf_size  i64     // size of the buffer
+	mem_buf_start i64 = -1 // start index in the file of the read buffer
+	mem_buf_end   i64 = -1 // end index in the file of the read buffer
+	// csv map for quick access
+	csv_map [][]i64
+	// header
+	header_row  int = -1 // row index of the header in the csv_map
+	header_list []HeaderItem   // list of the header item
+	header_map  map[string]int // map from header label to column index
+}