This helps with debugging and profiling binaries using native tools, such as WinDbg.
  Note that until now, C functions' SEH exception handlers were not being honored,
  so this change may cause some programs to behave differently.
  <code>-linkmode=external</code> is not affected by this change, as external linkers
  already preserve SEH information.
</p>

<h2 id="bootstrap">Bootstrap</h2>

<p>

for equality.
</p>

<p>
In a case or default clause, the last non-empty statement
may be a (possibly <a href="#Labeled_statements">labeled</a>)
<a href="#Fallthrough_statements">"fallthrough" statement</a> to
indicate that control should flow from the end of this clause to
the first statement of the next clause.
Otherwise control flows to the end of the "switch" statement.

for equality.
</p>

<p>
In a case or default clause, the last non-empty statement
may be a (possibly <a href="#Labeled_statements">labeled</a>)
<a href="#Fallthrough_statements">"fallthrough" statement</a> to
indicate that control should flow from the end of this clause to
the first statement of the next clause.
Otherwise control flows to the end of the "switch" statement.