another focussed bust of the C/C++ code freeze

[G. Branden Robinson]

Here's the patch.  It demotes an error diagnostic to a warning.

diff --git a/src/roff/troff/number.cpp b/src/roff/troff/number.cpp
index 0cc58dbc9..e650c4bdb 100644
--- a/src/roff/troff/number.cpp
+++ b/src/roff/troff/number.cpp
@@ -380,6 +380,11 @@ static bool is_valid_term(units *u, int scaling_unit,
       tok.next();
       is_negative = !is_negative;
     }
+    else if (tok.is_tab()) {
+      warning(WARN_TAB, "ignoring numeric expression starting with %1",
+             tok.description());
+      return false;
+    }
     else
       break;
   int c = tok.ch(); // safely compares to char literals; TODO: grochar

Rationale, background: https://savannah.gnu.org/bugs/?68017

Regards,
Branden

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