rem: return this.val = str; 
add: var old = SeenKeywords[str];  if (old === undefined) { SeenKeywords[str] = this; return this.val = str; } else { return old; } 
context: function sc_Keyword(str) { /// export    return this.val = str;}
meta: 4636	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/4636/14aae7a0e0d45ae9762394262ec1b01d286e82e2/runtime.js/clean/scheme2js/runtime/runtime.js