Experimental lexer generator: fix build errors (type-limits).

tools/lexer_generator/code_generator.jinja

 #include "lexer/even-more-experimental-scanner.h"
 
 
 // TODO implement CLASS checks
 {%- macro do_key(key) -%}
   {%- for r in key.range_iter() -%}
     {%- if not loop.first %} || {% endif -%}
     {%- if r[0] == 'LATIN_1' -%}
-      ({{r[1][0]}} <= yych && yych <= {{r[1][1]}})
+      {%- if r[1][0] == r[1][1] -%}
+        yych == {{r[1][0]}}
+      {%- elif r[1][0] == 0 -%}
+        yych <= {{r[1][1]}}
+      {%- elif r[1][1] == 255 -%}
+        yych >= {{r[1][0]}}
+      {%- else -%}
+        ({{r[1][0]}} <= yych && yych <= {{r[1][1]}})
+      {%- endif -%}
     {%- else -%}
       false
     {%- endif -%}
   {%- endfor -%}
 {%- endmacro -%}
 
 
 {% macro dispatch_action(type, value) -%}
   {%- if type == 'code' %}
     {{value}}
@@ skipping 102 matching lines @@
     {{dispatch_action(default_action[0], default_action[1])}}
   FORWARD();
   goto code_start;
   return 0;
 
   fell_through:
   CHECK(false);
 }
 } }