Update

src/write_base.rs

@@ -1,22 +1,30 @@
 use std::io::{Result, Write};
 
+/// TODO(document)
 #[inline]
 pub fn write_indent(indent: usize, write: &mut dyn Write) -> Result<()> {
     write!(write, "{}", "  ".repeat(indent))
 }
 
+/// TODO(document)
 pub trait WriteLine {
+    /// TODO(document)
     fn write_line(&self, indent: usize, write: &mut dyn Write) -> Result<()>;
 }
 
+/// TODO(document)
 pub trait WriteString {
+    /// TODO(document)
     fn write_string(&self) -> String;
 }
 
+/// TODO(document)
 pub trait WriteOp {
+    /// TODO(document)
     fn write_operation(&self) -> String;
 }
 
+/// TODO(document)
 pub fn write<T: WriteLine>(t: &T, write: &mut dyn Write) -> Result<()> {
     t.write_line(0, write)
 }