)

// startBlock sets the current block we're generating code in to b.
func (s *state) startBlock(b *ssa.Block) {
	if s.curBlock != nil {
		s.Fatalf("starting block %v when block %v has not ended", b, s.curBlock)
	}
	s.curBlock = b
	s.vars = map[ir.Node]*ssa.Value{}
	for n := range s.fwdVars {
		delete(s.fwdVars, n)
	}
}

// endBlock marks the end of generating code for the current block.

`?(r=1,n+=1):r+=1;return{line:n,column:r}}positionBy(e){let...