request better error message for malformed quasiquoted declaration

I closed a quasiquoted declaration form incorrectly (] rather than |]) and the error message I received was not enough to able me to diagnose the problem. The message I received was

Pnm.hs:40:1:
   lexical error in string/character literal at end of input

And I think a more appropriate message would be along the lines of "quasiquoted declaration that begins at line 17 was not terminated."

(I have listed "compiler" as the component but perhaps it should be "template haskell" instead?)

Trac metadata

Trac field	Value
Version	7.0.3
Type	FeatureRequest
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
Test case	attached to ticket
Differential revisions
BlockedBy
Related
Blocking
CC	mainland@eecs.harvard.edu
Operating system
Architecture