COMMIT Add spec for $! result after failed coercion by a core class against a method_missing-implementing class.	http://github.com/rubyspec/rubyspec/commit/21f836623f6f1a443ee833e9d94d0c2de31f7987

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+++ 20110304T212008Z
@@ 23565 @@
 - raises TypeError error if assigned to nil
 - raises TypeError error if assigned to object that doesn't respond to #write
 
+Predefined global $!
 - needs to be reviewed for spec completeness
 
 Predefined global $_
@@ 64097 @@
 - raises TypeError error if assigned to nil
 - raises TypeError error if assigned to object that doesn't respond to #write
 
+Predefined global $!
 - needs to be reviewed for spec completeness
 
 Predefined global $_