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* Fix yet another parser infinite loopAleksey Kladov2018-09-082-8/+10
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This commit is an example of fixing a common parser error: infinite loop due to error recovery. This error typically happens when we parse a list of items and fail to parse a specific item at the current position. One choices is to skip a token and try to parse a list item at the next position. This is a good, but not universal, default. When parsing a list of arguments in a function call, you, for example, don't want to skip over `fn`, because it's most likely that it is a function declaration, and not a mistyped arg: ``` fn foo() { quux(1, 2 fn bar() { } ``` Another choice is to bail out of the loop immediately, but it isn't perfect either: sometimes skipping over garbage helps: ``` quux(1, foo:, 92) // should skip over `:`, b/c that's part of `foo::bar` ``` In general, parser tries to balance these two cases, though we don't have a definitive strategy yet. However, if the parser accidentally neither skips over a token, nor breaks out of the loop, then it becomes stuck in the loop infinitely (there's an internal counter to self-check this situation and panic though), and that's exactly what is demonstrated by the test. To fix such situation, first of all, add the test case to tests/data/parser/{err,fuzz-failures}. Then, run ``` RUST_BACKTRACE=short cargo test --package libsyntax2 ```` to verify that parser indeed panics, and to get an idea what grammar production is the culprit (look for `_list` functions!). In this case, I see ``` 10: libsyntax2::grammar::expressions::atom::match_arm_list at crates/libsyntax2/src/grammar/expressions/atom.rs:309 ``` and that's look like it might be a culprit. I verify it by adding `eprintln!("loopy {:?}", p.current());` and indeed I see that this is printed repeatedly. Diagnosing this a bit shows that the problem is that `pattern::pattern` function does not consume anything if the next token is `let`. That is a good default to make cases like ``` let let foo = 92; ``` where the user hasn't typed the pattern yet, to parse in a reasonable they correctly. For match arms, pretty much the single thing we expect is a pattern, so, for a fix, I introduce a special variant of pattern that does not do recovery.
* move fuzz-invariants to the libraryAleksey Kladov2018-09-082-37/+43
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* Fix block structure in enumsAleksey Kladov2018-09-082-6/+15
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* simplifyAleksey Kladov2018-09-085-9/+14
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* Don't get stuck in tuple exprsAleksey Kladov2018-09-081-0/+4
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* Don't get stuck in macrosAleksey Kladov2018-09-081-1/+6
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* fix stuck parserAleksey Kladov2018-09-082-2/+11
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* fix labled expressionsAleksey Kladov2018-09-081-6/+16
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* nested mod completionAleksey Kladov2018-09-073-24/+21
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* Remove dyn dispatchAleksey Kladov2018-09-073-21/+65
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* Moved TokenSet into it's own file.Zac Winter2018-09-064-37/+41
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* Added tests for Ptr.Zach Lute2018-09-051-0/+78
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* Updated Ptr methods to better match Parser method names.Zach Lute2018-09-055-45/+59
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* simplifyAleksey Kladov2018-09-041-5/+5
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* for types in boundsAleksey Kladov2018-09-042-12/+21
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* accidentally quadraticAleksey Kladov2018-09-041-16/+35
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* extern blocksAleksey Kladov2018-09-032-1/+3
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* faster text lenAleksey Kladov2018-09-031-1/+1
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* completion for trait paramsAleksey Kladov2018-09-032-0/+2
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* Complete paramsAleksey Kladov2018-09-035-14/+43
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* method call scopeAleksey Kladov2018-09-033-6/+18
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* match scopeAleksey Kladov2018-09-022-6/+36
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* Type aliases to scopeAleksey Kladov2018-09-012-1/+4
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* complete selfAleksey Kladov2018-08-312-0/+23
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* default method name to type nameAleksey Kladov2018-08-313-83/+47
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* tweak extend selectionAleksey Kladov2018-08-311-0/+12
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* start item recoveryAleksey Kladov2018-08-315-9/+17
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* break/continue completionAleksey Kladov2018-08-303-16/+13
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* complete importsAleksey Kladov2018-08-302-5/+106
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* Complete typesAleksey Kladov2018-08-302-1/+20
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* add impl works with lifetimesAleksey Kladov2018-08-284-8/+119
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* simplifyAleksey Kladov2018-08-281-0/+3
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* be more careful with adding semisAleksey Kladov2018-08-281-0/+6
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* Add ret typeAleksey Kladov2018-08-284-0/+29
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* better pattern recoveryAleksey Kladov2018-08-283-2/+12
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* complete items from module scopeAleksey Kladov2018-08-282-0/+5
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* join any blockAleksey Kladov2018-08-282-0/+23
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* Simplify APIAleksey Kladov2018-08-282-5/+1
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* Avoid materializing stringsAleksey Kladov2018-08-285-21/+129
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* tone down on eq typedAleksey Kladov2018-08-281-1/+1
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* better recovery for exprsAleksey Kladov2018-08-285-8/+113
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* Log errorsAleksey Kladov2018-08-271-0/+10
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* Add runnablesAleksey Kladov2018-08-272-1/+13
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* Fix error blocksAleksey Kladov2018-08-274-0/+17
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* move scopes to fileAleksey Kladov2018-08-271-2/+2
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* Support if-let in scopesAleksey Kladov2018-08-275-16/+108
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* visitor-less scopesAleksey Kladov2018-08-272-2/+35
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* scopesAleksey Kladov2018-08-275-5/+44
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* fix curly braces parsingAleksey Kladov2018-08-261-2/+9
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* scope based comletionAleksey Kladov2018-08-265-16/+422
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