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<span class="hljs-comment"># Valid names</span>
a1_foo, A1_FOO, .foo_, ._foo, Bar.42, foo..1, ., ._, .., ..., ..1, <span class="hljs-built_in">c</span>, <span class="hljs-built_in">T</span>, <span class="hljs-built_in">F</span>, ._1
<span class="hljs-comment"># Reserved Words</span>
<span class="hljs-literal">NA</span>, <span class="hljs-literal">NA_integer_</span>, <span class="hljs-literal">NA_real_</span>, <span class="hljs-literal">NA_character_</span>, <span class="hljs-literal">NA_complex_</span>, <span class="hljs-literal">NULL</span>, <span class="hljs-literal">NaN</span>, <span class="hljs-literal">Inf</span>
<span class="hljs-comment"># Keywords</span>
<span class="hljs-keyword">function</span>, <span class="hljs-keyword">while</span>, <span class="hljs-keyword">repeat</span>, <span class="hljs-keyword">for</span>, <span class="hljs-keyword">if</span>, <span class="hljs-keyword">in</span>, <span class="hljs-keyword">else</span>, <span class="hljs-keyword">next</span>, <span class="hljs-keyword">break</span>
<span class="hljs-comment"># Not reserved</span>
NULLa, NULL1, NULL., `NULL`, <span class="hljs-string">'NULL'</span>, NA_foo_, na_real_, Function, for.
<span class="hljs-comment"># Primitive built-ins</span>
<span class="hljs-built_in">return</span>, <span class="hljs-built_in">switch</span>, <span class="hljs-built_in">sum</span>
<span class="hljs-comment"># Non-primitive base functions</span>
stop, try
<span class="hljs-comment"># Quoted identifiers</span>
`+`
`%*%`
`a 10 b`
`for`
`# x`
`\`b`
`\\`
`%\`%`
<span class="hljs-comment"># Invalid names (for reference)</span>
<span class="hljs-comment"># 0abc, .0abc, abc+cde, _, _., _x, _1, .1_</span>
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