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loader: fix panic in CGo files with syntax errors
If all of the Go files presented to the compiler have syntax errors, cgo.Process gets an empty files slice and will panic: panic: runtime error: index out of range [0] with length 0 goroutine 1 [running]: github.com/tinygo-org/tinygo/cgo.Process({0x0, 0x4e8e36, 0x0}, {0xc000024104, 0x18}, 0xc000090fc0, {0xc000899780, 0x7, 0xc00018ce68}) /home/ayke/src/github.com/tinygo-org/tinygo/cgo/cgo.go:186 +0x22ee github.com/tinygo-org/tinygo/loader.(*Package).parseFiles(0xc0001ccf00) /home/ayke/src/github.com/tinygo-org/tinygo/loader/loader.go:400 +0x51e This is simple to work around: just don't try to run CGo when there are no files to process. It just means there are bugs to fix before CGo can properly run. (This is perhaps not the nicest solution but certainly the simplest).
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