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This is reported by oss-fuzz:
Issue 19886: mruby:mruby_fuzzer: Potential-null-reference in setup_numparams
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It is stricter than CRuby but confusing anyway.
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But it causes warnings as CRuby does; fix #4892 fix #489
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As of CRuby2.7 it is only warned. `mruby` prohibits explicitly to
implement the future Ruby3 behavior.
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`mruby` does not warn like `CRuby` for cases like #4893.
Fix #4890, fix #4891, fix #4893.
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#### Before this patch:
```console
$ bin/mruby rb -e '_0=:l; p ->{_0}.()'
-e:1:13: _0 is not available
-e:1:13: syntax error, unexpected $end, expecting '}'
```
#### After this patch (same as Ruby):
```console
$ bin/mruby rb -e '_0=:l; p ->{_0}.()'
:l
```
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Now identifiers like `_1abc` are allowed.
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I think they can always be enabled because the regular expression literal is
always enabled.
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#### Before this patch:
```
$ bin/mruby -e 'p <<EOS
1
EOS'
-e:4:0: can't find heredoc delimiter "EOS" anywhere before EOF
-e:4:0: syntax error, unexpected $end, expecting tHEREDOC_END or tHD_STRING_PART or tHD_STRING_MID
```
#### After this patch (same as Ruby):
```
$ bin/mruby -e 'p <<EOS
1
EOS'
"1\n"
```
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This is caused by incomplete fix in #4746
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For example, local variables in the following def:
```ruby
def foo(a = (not_set = true), &block)
...
end
```
should be `a, block, not_set`, but were `a, not_set, block`.
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Escape the AST string
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#### Before this patch:
```terminal
$ bin/mruby -v -e '%w[1 2]'
mruby 2.0.1 (2019-04-04)
00001 NODE_SCOPE:
00001 NODE_BEGIN:
00001 NODE_WORDS:
00001 NODE_STR "1" len 1
00001 node type: 85 (0x55)
00001 NODE_STR "2" len 1
(snip)
```
#### After this patch:
```terminal
$ bin/mruby -v -e '%w[1 2]'
mruby 2.0.1 (2019-04-04)
00001 NODE_SCOPE:
00001 NODE_BEGIN:
00001 NODE_WORDS:
00001 NODE_STR "1" len 1
00001 NODE_LITERAL_DELIM
00001 NODE_STR "2" len 1
(snip)
```
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#### Before this patch:
```terminal
$ bin/mruby -v -e '%i[1]; %I[#{2}]'
mruby 2.0.1 (2019-04-04)
00001 NODE_SCOPE:
00001 NODE_BEGIN:
00001 node type: 87 (0x57)
00001 node type: 87 (0x57)
(snip)
```
#### After this patch:
```terminal
$ bin/mruby -v -e '%i[1]; %I[#{2}]'
mruby 2.0.1 (2019-04-04)
00001 NODE_SCOPE:
00001 NODE_BEGIN:
00001 NODE_SYMBOLS:
00001 NODE_STR "1" len 1
00001 NODE_SYMBOLS:
00001 NODE_STR "" len 0
00001 NODE_BEGIN:
00001 NODE_INT 2 base 10
00001 NODE_STR "" len 0
(snip)
```
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#### Before this patch:
```terminal
$ bin/mruby -v -e '%w[1]; %W[#{2}]'
mruby 2.0.1 (2019-04-04)
00001 NODE_SCOPE:
00001 NODE_BEGIN:
00001 node type: 86 (0x56)
00001 node type: 86 (0x56)
(snip)
```
#### After this patch:
```terminal
$ bin/mruby -v -e '%w[1]; %W[#{2}]'
mruby 2.0.1 (2019-04-04)
00001 NODE_SCOPE:
00001 NODE_BEGIN:
00001 NODE_WORDS:
00001 NODE_STR "1" len 1
00001 NODE_WORDS:
00001 NODE_STR "" len 0
00001 NODE_BEGIN:
00001 NODE_INT 2 base 10
00001 NODE_STR "" len 0
(snip)
```
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#### Before this patch:
```terminal
$ bin/mruby -v -e ':"#{1}"; ["#{2}": 0]'
mruby 2.0.1 (2019-04-04)
00001 NODE_SCOPE:
00001 NODE_BEGIN:
00001 node type: 83 (0x53)
00001 NODE_ARRAY:
00001 NODE_KW_HASH:
00001 key:
00001 node type: 83 (0x53)
00001 value:
00001 NODE_INT 0 base 10
(snip)
```
#### After this patch:
```terminal
$ bin/mruby -v -e ':"#{1}"; ["#{2}": 0]'
mruby 2.0.1 (2019-04-04)
00001 NODE_SCOPE:
00001 NODE_BEGIN:
00001 NODE_DSYM:
00001 NODE_DSTR:
00001 NODE_STR "" len 0
00001 NODE_BEGIN:
00001 NODE_INT 1 base 10
00001 NODE_STR "" len 0
00001 NODE_ARRAY:
00001 NODE_KW_HASH:
00001 key:
00001 NODE_DSYM:
00001 NODE_DSTR:
00001 NODE_STR "" len 0
00001 NODE_BEGIN:
00001 NODE_INT 2 base 10
00001 NODE_STR "" len 0
00001 value:
00001 NODE_INT 0 base 10
(snip)
```
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* mrb_sym2name -> mrb_sym_name
* mrb_sym2name_len -> mrb_sym_name_len
* mrb_sym2str -> mrb_sym_str
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Support parsing a Regexp literal with 'o' option
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#4706"
The `bison` on MacOS does not support `%define api.pure`.
This reverts commit f7c9f1f796d83b9316917681ea068ff648248425.
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`strncat()` also needs `'\0'`.
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The binary sizes (gems are only `mruby-bin-mruby`) are reduced slightly in
my environment than before the introduction of new specifiers/modifiers
(5116789a) with this change.
------------+-------------------+-------------------+--------
BINARY | BEFORE (5116789a) | AFTER (This PR) | RATIO
------------+-------------------+-------------------+--------
mruby | 593416 bytes | 593208 bytes | -0.04%
libmruby.a | 769048 bytes | 767264 bytes | -0.23%
------------+-------------------+-------------------+--------
BTW, I accidentally changed `tasks/toolchains/visualcpp.rake` at #4613,
so I put it back.
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Also fix the misfeature introduced in 23783a4, that ignores newlines
between method chains.
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Originally, it was not necessary to change. I made mistake.
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CRuby supports a 'o' `Regexp` option for `Regexp` literals, e.g. `/foo/o` that disables multiple interpolation passes.
This commit adds support for parsing such literals. Nothing is done with the option, it is consumed and ignored by the parser.
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It used heap allocated memory for the parser stack, but there's
possibility of parser termination by exceptions. In that case, the
parser stack memory is leaked.
We were afraid of stack consumption, but parser stack size is only 4KB,
so we don't have to worry about it (at least for the parser).
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