The warnings that can be given to `gtroff' are divided into the
following categories. The name associated with each warning is used by
the `-w' and `-W' options; the number is used by the `warn' request and
by the `.warn' register.
Non-existent glyphs.(1) (Note: Warnings-Footnote-1) This is
enabled by default.
Invalid numeric expressions. This is enabled by default. Note:
In fill mode, lines which could not be broken so that their length
was less than the line length. This is enabled by default.
Missing or mismatched closing delimiters.
Use of the `el' request with no matching `ie' request. Note:
Meaningless scaling indicators.
Out of range arguments.
Dubious syntax in numeric expressions.
Use of `di' or `da' without an argument when there is no current
Use of undefined strings, macros and diversions. When an undefined
string, macro, or diversion is used, that string is automatically
defined as empty. So, in most cases, at most one warning is given
for each name.
Use of undefined number registers. When an undefined number
register is used, that register is automatically defined to have a
value of 0. So, in most cases, at most one warning is given for
use of a particular name.
Use of a tab character where a number was expected.
Use of `\}' where a number was expected.
Requests that are missing non-optional arguments.
Invalid input characters.
Unrecognized escape sequences. When an unrecognized escape
sequence `\X' is encountered, the escape character is ignored, and
X is printed.
Missing space between a request or macro and its argument. This
warning is given when an undefined name longer than two characters
is encountered, and the first two characters of the name make a
defined name. The request or macro is not invoked. When this
warning is given, no macro is automatically defined. This is
enabled by default. This warning never occurs in compatibility
Non-existent fonts. This is enabled by default.
Invalid escapes in text ignored with the `ig' request. These are
conditions that are errors when they do not occur in ignored text.
Color related warnings.
All warnings except `di', `mac' and `reg'. It is intended that
this covers all warnings that are useful with traditional macro
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