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MessageList
MessageList[
n
] is a global object assigned to be a list of the names of messages generated during the processing of the n
 input line.
Only messages that are actually output are included in the list MessageList[
n
].
The message names in the list are wrapped with HoldForm.
MessageList[
n
] includes messages generated both by built-in functions and by explicit invocations of Message.
See the Mathematica book: Section 2.8.21, Section 2.13.1.
See also: $MessageList.
Further Examples
This returns $MessageList (the value of which is assigned to MessageList[n]), which gives a list of the messages produced.
In[1]:= 
Sqrt::argx: Sqrt called with 3 arguments; 1 argument is expected.
Exp::argx: Exp called with 2 arguments; 1 argument is expected.
Out[1]= 
The message names are wrapped in HoldForm to stop them from evaluating.
In[2]:= 
Out[2]//InputForm= 
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