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parser: deprecate %nterm

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It has several weaknesses.
Reported by Rici Lake.
http://lists.gnu.org/archive/html/bug-bison/2018-10/msg00000.html

* src/scan-gram.l: here.
This commit is contained in:
Akim Demaille
2018-11-11 19:16:56 +01:00
parent 8d454b843c
commit 7928c3e6fb
5 changed files with 30 additions and 32 deletions
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38
tests/reduce.at
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@@ -73,32 +73,20 @@ AT_DATA([[input.y]],
[[%verbose
%output "input.c"
%nterm useless1
%nterm useless2
%nterm useless3
%nterm useless4
%nterm useless5
%nterm useless6
%nterm useless7
%nterm useless8
%nterm useless9
%token useful
%%
exp: useful;
useless1:
useless2:
useless3:
]])
AT_BISON_CHECK([[input.y]], 0, [],
[[input.y: warning: 9 nonterminals useless in grammar [-Wother]
input.y:4.8-15: warning: nonterminal useless in grammar: useless1 [-Wother]
input.y:5.8-15: warning: nonterminal useless in grammar: useless2 [-Wother]
input.y:6.8-15: warning: nonterminal useless in grammar: useless3 [-Wother]
input.y:7.8-15: warning: nonterminal useless in grammar: useless4 [-Wother]
input.y:8.8-15: warning: nonterminal useless in grammar: useless5 [-Wother]
input.y:9.8-15: warning: nonterminal useless in grammar: useless6 [-Wother]
input.y:10.8-15: warning: nonterminal useless in grammar: useless7 [-Wother]
input.y:11.8-15: warning: nonterminal useless in grammar: useless8 [-Wother]
input.y:12.8-15: warning: nonterminal useless in grammar: useless9 [-Wother]
[[input.y: warning: 3 nonterminals useless in grammar [-Wother]
input.y: warning: 3 rules useless in grammar [-Wother]
input.y:7.1-8: warning: nonterminal useless in grammar: useless1 [-Wother]
input.y:8.1-8: warning: nonterminal useless in grammar: useless2 [-Wother]
input.y:9.1-8: warning: nonterminal useless in grammar: useless3 [-Wother]
]])
AT_CHECK([[sed -n '/^Grammar/q;/^$/!p' input.output]], 0,
@@ -106,12 +94,10 @@ AT_CHECK([[sed -n '/^Grammar/q;/^$/!p' input.output]], 0,
useless1
useless2
useless3
useless4
useless5
useless6
useless7
useless8
useless9
Rules useless in grammar
2 useless1: %empty
3 useless2: %empty
4 useless3: %empty
]])
AT_CLEANUP