Function rb_str_drop_bytes 

pub unsafe extern "C" fn rb_str_drop_bytes(
    str_: VALUE,
    len: c_long,
) -> VALUE

Shrinks the given string for the given number of bytes.

@param[out] str String to squash. @param[in] len Number of bytes to reduce. @exception rb_eRuntimeError str is locktmp-ed. @exception rb_eFrozenError str is frozen. @return The passed str. @pre str must not be any arbitrary objects except ::RString. @post str is shrunken. @warning Can break a multibyte character in middle.

@internal

What if len is negative?

Generated by rb-sys for Ruby mri-x86_64-linux-gnu-3.3.8