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Displaying the language
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   The following commands help you find out which language is the
working language, and also what language source files were written in.

`show language'
     Display the current working language.  This is the language you
     can use with commands such as `print' to build and compute
     expressions that may involve variables in your program.

`info frame'
     Display the source language for this frame.  This language becomes
     the working language if you use an identifier from this frame.
     Note: Information about a frame, to identify the other
     information listed here.

`info source'
     Display the source language of this source file.  Note: Examining
     the Symbol Table, to identify the other information
     listed here.

   In unusual circumstances, you may have source files with extensions
not in the standard list.  You can then set the extension associated
with a language explicitly:

`set extension-language .EXT LANGUAGE'
     Set source files with extension .EXT to be assumed to be in the
     source language LANGUAGE.

`info extensions'
     List all the filename extensions and the associated languages.