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Reference grammar.
Uses [antlr4](http://www.antlr.org/) and a custom Rust tool to compare
ASTs/token streams generated. You can use the `check-lexer` make target to
run all of the available tests.
To use manually:
```
antlr4 RustLexer.g4
javac *.java
rustc -O verify.rs
for file in ../*/**.rs; do
echo $file;
grun RustLexer tokens -tokens < "$file" | ./verify "$file" RustLexer.tokens || break
done
```
Note That the `../*/**.rs` glob will match every `*.rs` file in the above
directory and all of its recursive children. This is a zsh extension.
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