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fix: don't die when EOF token is defined twice

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With

    %token EOF 0 EOF 0

we get

    input.y:3.14-16: warning: symbol EOF redeclared [-Wother]
        3 | %token EOF 0 EOF 0
          |              ^~~
    input.y:3.8-10: previous declaration
        3 | %token EOF 0 EOF 0
          |        ^~~
    Assertion failed: (nsyms == ntokens + nvars), function check_and_convert_grammar,
        file /Users/akim/src/gnu/bison/src/reader.c, line 839.

Reported by Marc Schönefeld.

* src/symtab.c (symbol_user_token_number_set): Register only the
first definition of the end of input token.
* tests/input.at (Symbol redeclared): Check that case.
This commit is contained in:
Akim Demaille
2019-09-07 16:32:20 +02:00
parent 378963b139
commit 7d701f4378
3 changed files with 9 additions and 2 deletions
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8
tests/input.at
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@@ -624,7 +624,7 @@ AT_SETUP([Symbol redeclared])
AT_DATA([[input.y]],
[[%token FOO FOO
%token BAR 12 BAR 12
%token EOF 0 EOF 0
%%
exp: FOO BAR
]])
@@ -642,6 +642,12 @@ input.y:2.15-17: warning: symbol BAR redeclared [-Wother]
input.y:2.8-10: previous declaration
2 | %token BAR 12 BAR 12
| ^~~
input.y:3.14-16: warning: symbol EOF redeclared [-Wother]
3 | %token EOF 0 EOF 0
| ^~~
input.y:3.8-10: previous declaration
3 | %token EOF 0 EOF 0
| ^~~
]])
AT_CLEANUP