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mkustermann avatar mkustermann commented on August 22, 2024 1

If your investigation yields a decision to keep them for -O4, will there still be a flag to omit them?

Right now it's not explicitly exposed by flutter build web or dart compile wasm, but one could use it via dart compile wasm --extra-compiler-option=--omit-explicit-checks.

(Notice that dart2js -O4 drops implicit checks but keeps explicit checks. So this issue is tracking us to align with dart2js)

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mnordine avatar mnordine commented on August 22, 2024

If your investigation yields a decision to keep them for -O4, will there still be a flag to omit them?

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sigmundch avatar sigmundch commented on August 22, 2024

Cool to see this @mkustermann!

About the iterator example you mention. Are you referring to covariant checks? Or actual explicit as expressions? I ask also for the purpose of aligning with dart2js: dart2js -O3 not only omits implicit downcasts from dynamic, but also implicit parameter checks (which can come from a dynamic invocation or an explicit covariance check)

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