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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>MFTL</title><link rel="stylesheet" href="../../jargon.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.61.0"/><link rel="home" href="../index.html" title="The Jargon File"/><link rel="up" href="../M.html" title="M"/><link rel="previous" href="metasyntactic-variable.html" title="metasyntactic variable"/><link rel="next" href="mickey.html" title="mickey"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">MFTL</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="metasyntactic-variable.html">Prev</a> </td><th width="60%" align="center">M</th><td width="20%" align="right"> <a accesskey="n" href="mickey.html">Next</a></td></tr></table><hr/></div><dt><a id="MFTL"/><dt xmlns="" id="MFTL"><b>MFTL</b>: <span xmlns="http://www.w3.org/1999/xhtml" class="pronunciation">/M·F·T·L/</span></dt></dt><dd><p> [abbreviation: &#8216;My Favorite Toy Language&#8217;]</p></dd><dd><p> 1. <span class="grammar">adj.</span> Describes a talk on a
programming language design that is heavy on the syntax (with lots of BNF),
sometimes even talks about semantics (e.g., type systems), but rarely, if
ever, has any content (see <a href="../C/content-free.html"><i class="glossterm">content-free</i></a>). More
broadly applied to talks &#8212; even when the topic is not a programming
language &#8212; in which the subject matter is gone into in unnecessary
and meticulous detail at the sacrifice of any conceptual content.
&#8220;<span class="quote">Well, it was a typical MFTL talk</span>&#8221;. </p></dd><dd><p> 2. <span class="grammar">n.</span> Describes a language about
which the developers are passionate (often to the point of proselytic zeal)
but no one else cares about. Applied to the language by those outside the
originating group. &#8220;<span class="quote">He cornered me about type resolution in his
MFTL.</span>&#8221;</p><p>The first great goal in the mind of the designer of an MFTL is
usually to write a compiler for it, then bootstrap the design away from
contamination by lesser languages by writing a compiler for it in itself.
Thus, the standard put-down question at an MFTL talk is &#8220;<span class="quote">Has it been
used for anything besides its own compiler?</span>&#8221; On the other hand, a
(compiled) language that cannot even be used to write its own compiler is
beneath contempt. (The qualification has become necessary because of the
increasing popularity of interpreted languages like
<a href="../P/Perl.html"><i class="glossterm">Perl</i></a> and <a href="../P/Python.html"><i class="glossterm">Python</i></a>.) See
<a href="../B/break-even-point.html"><i class="glossterm">break-even point</i></a>. (On a related note, Doug McIlroy
once proposed a test of the generality and utility of a language and the
operating system under which it is compiled: &#8220;<span class="quote">Is the output of a
FORTRAN program acceptable as input to the FORTRAN compiler?</span>&#8221; In
other words, can you write programs that write programs? (See
<a href="../T/toolsmith.html"><i class="glossterm">toolsmith</i></a>.) Alarming numbers of (language, OS)
pairs fail this test, particularly when the language is FORTRAN;
aficionados are quick to point out that <a href="../U/Unix.html"><i class="glossterm">Unix</i></a> (even
using FORTRAN) passes it handily. That the test could ever be failed is
only surprising to those who have had the good fortune to have worked only
under modern systems which lack OS-supported and -imposed &#8220;<span class="quote">file
types</span>&#8221;.)</p></dd><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="metasyntactic-variable.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="../M.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="mickey.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">metasyntactic variable </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> mickey</td></tr></table></div></body></html>