Bug 273411 – ASSERTION FAILED: !behaviors.containsAny({ Behavior::Break, Behavior::Continue })

• Component: WebGPU
• Status: RESOLVED FIXED

On git commit e9acc98eb155a5d5a45ea8fb4e763ff4cede6eb0, compiling the attached shader program with `./wgslfuzz shader.wgsl f` triggers an assertion violation.

```
fn f() { if floor { break; } }
```


#0  __pthread_kill_implementation (no_tid=0, signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:44
#1  __pthread_kill_internal (signo=6, threadid=<optimized out>) at ./nptl/pthread_kill.c:78
#2  __GI___pthread_kill (threadid=<optimized out>, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#3  0x00007f5d278bb8e6 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#4  0x00007f5d2789f8b7 in __GI_abort () at ./stdlib/abort.c:79
#5  0x000055919dbcea30 in WTFCrashWithInfo () at WTF/Headers/wtf/Assertions.h:862
#6  0x000055919dfe471c in WGSL::TypeChecker::visit (this=0x7f5d25b01620, function=...) at Source/WebGPU/WGSL/TypeCheck.cpp:727
#7  0x000055919e0a2971 in WGSL::AST::Visitor::checkErrorAndVisit<WGSL::AST::Declaration> (this=0x7f5d25b01620, x=...) at Source/WebGPU/WGSL/AST/ASTVisitor.h:135
#8  WGSL::AST::Visitor::visit (this=0x7f5d25b01620, shaderModule=...) at Source/WebGPU/WGSL/AST/ASTVisitor.cpp:51
#9  0x000055919dfd9fd2 in WGSL::TypeChecker::check (this=0x7f5d25b01620) at Source/WebGPU/WGSL/TypeCheck.cpp:439
#10 0x000055919e018f60 in WGSL::typeCheck (shaderModule=...) at Source/WebGPU/WGSL/TypeCheck.cpp:2449
#11 0x000055919e08cca1 in WGSL::staticCheck(WTF::String const&, std::optional<WGSL::SourceMap> const&, WGSL::Configuration const&)::$_2::operator()() const (this=<optimized out>)
    at Source/WebGPU/WGSL/WGSL.cpp:76
#12 WGSL::staticCheck (wgsl=..., configuration=...) at Source/WebGPU/WGSL/WGSL.cpp:76
#13 0x000055919e08b13d in runWGSL (options=...) at Source/WebGPU/WGSL/wgslc.cpp:122
#14 main (argc=<optimized out>, argv=<optimized out>) at Source/WebGPU/WGSL/wgslc.cpp:164

[Radar WebKit Bug Importer]

<rdar://problem/127310621>

[Tadeu Zagallo]

Pull request: https://github.com/WebKit/WebKit/pull/28396

[EWS]

Committed 278681@main (2e8bbb15e393): <https://commits.webkit.org/278681@main>

Reviewed commits have been landed. Closing PR #28396 and removing active labels.