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Allow nested bracketed symbols
Fixes #320

--- a/src/asm/lexer.c

+++ b/src/asm/lexer.c

@@ -666,6 +666,11 @@

 				i += length;

 			else

 				fatalerror("Illegal character escape '%c'", ch);

+		} else if (ch == '{') {

+			/* Handle nested symbols */

+			++pLexBuffer;

+			i += yylex_ReadBracketedSymbol(sym, i);

+			--pLexBuffer;

 		} else if (ch == ':' && !mode) { /* Only grab 1st colon */

 			/* Use a whitelist of modes, which does prevent the

 			 * use of some features such as precision,