[except.uncaught] Tidy the specification for uncaught exceptions

Several concurrent fixes.  First include the normative wording
that 'uncaught_exceptions' returns the number of uncaught
exceptions *on the current thread*.  This wording is present
in the core language.

Then move the core wording for when an exception is uncaught
directly into the text that talks about caught and uncaught
exceptions.  In the process, turn the reference to into a note,
so that there is only one normative specification.

Finally, remove [except.uncaught] as it is now empty.

Author: AlisdairM

source/exceptions.tex

@@ -317,6 +317,26 @@
 the selected constructor is odr-used\iref{basic.def.odr} and
 the destructor of \tcode{T} is potentially invoked\iref{class.dtor}.
 
+\pnum
+\indextext{exception handling!uncaught}%
+An exception is considered \defnx{uncaught}{uncaught exception}
+after completing the initialization of the exception object
+until completing the activation of a handler for the exception\iref{except.handle}.
+\begin{note}
+As a consequence, an exception is considered uncaught
+during any stack unwinding resulting from it being thrown.
+\end{note}
+
+\pnum
+\indexlibraryglobal{uncaught_exceptions}%
+If an exception is rethrown\iref{expr.throw,propagation},
+it is considered uncaught from the point of rethrow
+until the rethrown exception is caught.
+\begin{note}
+The function \tcode{std::uncaught_exceptions}\iref{uncaught.exceptions}
+returns the number of uncaught exceptions in the current thread.
+\end{note}
+
 \pnum
 \indextext{exception handling!rethrow}%
 \indextext{rethrow|see{exception handling, rethrow}}%
@@ -331,7 +351,7 @@
 \indextext{exception handling!terminate called@\tcode{terminate} called}%
 \indextext{\idxcode{terminate}!called}%
 If the exception handling mechanism
-handling an uncaught exception\iref{except.uncaught}
+handling an uncaught exception
 directly invokes a function that exits via an
 exception, the function \tcode{std::terminate} is invoked\iref{except.terminate}.
 \begin{example}
@@ -1127,21 +1147,4 @@
 prematurely based on a determination that the unwind process
 will eventually cause an invocation of the function
 \tcode{std::terminate}.
-
-\rSec2[except.uncaught]{The \tcode{std::uncaught_exceptions} function}%
-\indexlibraryglobal{uncaught_exceptions}
-
-\pnum
-An exception is considered uncaught
-after completing the initialization of the exception object\iref{except.throw}
-until completing the activation of a handler for the exception\iref{except.handle}.
-\begin{note}
-As a consequence, an exception is considered uncaught
-during any stack unwinding resulting from it being thrown.
-\end{note}
-If an exception is rethrown\iref{expr.throw,propagation},
-it is considered uncaught from the point of rethrow
-until the rethrown exception is caught.
-The function \tcode{std::uncaught_exceptions}\iref{uncaught.exceptions}
-returns the number of uncaught exceptions in the current thread.%
 \indextext{exception handling|)}

source/support.tex

@@ -4050,7 +4050,7 @@
 \begin{itemdescr}
 \pnum
 \returns
-The number of uncaught exceptions\iref{except.uncaught}.
+The number of uncaught exceptions\iref{except.throw} in the current thread.
 
 \pnum
 \remarks

source/xrefdelta.tex

@@ -473,6 +473,9 @@
 \movedxref{stoptoken.cons}{stopsource}
 \movedxref{stoptoken.nonmembers}{stopsource}
 
+% https://github.com/cplusplus/draft/pull/7276
+\movedxref{except.uncaught}{except.throw}
+
 % https://github.com/cplusplus/draft/pull/7345
 \movedxref{basic.stc.inherit}{basic.stc.general}