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Early error on missing import #4

@bmeck

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@bmeck

I was unable to figure out the full workflow of xsl to run it without mcconfig quickly, but it seems to not give an error at compile/link time about missing a dependency:

manifest.json

{
	"include": "$(MODDABLE)/examples/manifest_base.json",
	"modules": {
		"*": [
			"./main"
		]
	},
}

main.js

import {message} from "dep";
trace(message + "\n");

dep.js

export const message = "Hello world!";

Will compile "successfully" using mcconfig -d -m -p mac with the output:

> mcconfig -d -m -p mac
# xsl modules
# mcrez resources
# cc mc.resources.c
# cc mc.xs.c
# ld mc.so
> echo $?
0

This error is hidden until runtime as seen in xsbug:

screen shot 2017-12-01 at 1 58 09 pm

The .xsb files contain enough information to provide an early error, but I am unclear on xsl's internals to patch it to output such an error.

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