Method push

crates/core/src/alloc/string.rs:183–187

(&mut self, c: char)

    /// failure.
    #[inline]
    pub fn push(&mut self, c: char) -> Result<(), OutOfMemory> {
        self.reserve(c.len_utf8())?;
        self.inner.push(c);
        Ok(())
    }

    /// Same as [`std::string::String::push_str`] but returns an error on
    /// allocation failure.