40264
13867 MessageBrowser does not inform about certain syntax error	https://pharo.fogbugz.com/f/cases/1386713293 We should add definedSelectors and extensionSelectors to ClassDescription	https://pharo.fogbugz.com/f/cases/1329313934 Extra characters in string returned by String class>>new:streamContents:	https://pharo.fogbugz.com/f/cases/13934

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