qiyao wrote:

> Fixes the following warnings during lldb build on FreeBSD (could not observe 
> on macOS): 

I can reproduce these warnings on macOS, with `tree-sitter` and 
`tree-sitter-cli` installed.
```
%  ninja tree-sitter-swift
[1/4] Generating src/parser.c
Warning: rule super_expression contains a `seq` rule with a single element. 
this is unnecessary.
Warning: rule inheritance_modifier contains a `choice` rule with a single 
element. this is unnecessary.
Warning: rule diagnostic contains a `seq` rule with a single element. this is 
unnecessary.
Warning: rule diagnostic contains a `seq` rule with a single element. this is 
unnecessary.
Warning: rule diagnostic contains a `seq` rule with a single element. this is 
unnecessary.
```


https://github.com/llvm/llvm-project/pull/221781
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