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WASM validation errors when using generic getters? #1675

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@jriehl

So a funny thing happened while on my way to trying to demonstrate #1635. Running from a fresh install of https://github.com/jriehl/sandbox/tree/master/assemblyscript/issue1635, I see the following:

% npm run asbuild

> issue1635@1.0.0 asbuild
> npm run asbuild:untouched && npm run asbuild:optimized


> issue1635@1.0.0 asbuild:untouched
> asc assembly/index.ts --target debug

[wasm-validator error in function export:assembly/tree/Tree.Node<i32>#get:payload] unexpected false: local.get index must be small enough, on 
(local.get $0)
[wasm-validator error in function export:assembly/tree/Tree.Node<i32>#get:payload] unexpected false: call target must exist, on 
(call $assembly/tree/Tree.Node<i32>#get:payload)
[wasm-validator error in function export:assembly/tree/Tree.Node<i32>#get:left] unexpected false: local.get index must be small enough, on 
(local.get $0)
[wasm-validator error in function export:assembly/tree/Tree.Node<i32>#get:left] unexpected false: call target must exist, on 
(call $assembly/tree/Tree.Node<i32>#get:left)
[wasm-validator error in function export:assembly/tree/Tree.Node<i32>#get:right] unexpected false: local.get index must be small enough, on 
(local.get $0)
[wasm-validator error in function export:assembly/tree/Tree.Node<i32>#get:right] unexpected false: call target must exist, on 
(call $assembly/tree/Tree.Node<i32>#get:right)
FAILURE validate error
    at Object.main (/Users/jon/git/sandbox/assemblyscript/issue1635/node_modules/assemblyscript/cli/asc.js:850:23)
    at /Users/jon/git/sandbox/assemblyscript/issue1635/node_modules/assemblyscript/bin/asc:19:47

I don't know why the getters aren't being emitted for the Node class, but that seems to be what the WASM validator is complaining about.

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