ceylon/ceylon-spec — Issue #174: Can't use I (upper case i) as character literal
Author: FroMage
Created: 2012-02-10 16:59:08+00:00
State: open
Labels: bug, high priority

The lexer disallows it explicitely:

```java
// /home/stephane/src/java-eclipse/ceylon-spec/Ceylon.g:2785:15: ~ NonCharacterChars
{
if ( (input.LA(1) >= '\u0000' && input.LA(1) <= 'H')||(input.LA(1) >= 'J' && input.LA(1) <= '\uFFFF') ) {
```

`CeylonLexer.java` line 892.

I tried to see why it did that but failed.