orrect oversight so that no warning is given if a class implements Function, has no call() method b…

docs/language/dartLangSpec.tex

Index: docs/language/dartLangSpec.tex
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--- docs/language/dartLangSpec.tex	(revision 31772)
+++ docs/language/dartLangSpec.tex	(working copy)
@@ -5500,7 +5500,7 @@
 
 % ensure that Object  and dynamic may be assign dot a function type
 A function is always an instance of some class that implements the class \code{Function} and implements a \CALL{} method with the same signature as the function. All function types are subtypes of \code{Function}.
-If a type $I$ includes an instance method named \CALL{}, and the type of \CALL{} is the function type $F$, then $I$ is considered to be a subtype of $F$.  It is a static warning if a concrete class implements \cd{Function} and does not have a concrete method named \CALL{}.
+If a type $I$ includes an instance method named \CALL{}, and the type of \CALL{} is the function type $F$, then $I$ is considered to be a subtype of $F$.  It is a static warning if a concrete class implements \cd{Function} and does not have a concrete method named \CALL{} unless that class declares its own implementation of \cd{noSuchMethod()}.