Add LIST node type to replace ',' nodes #149
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',' nodes were used to make lists, but that made it confusing since ',' is also used for the comma operator whose nodes had a slightly different shape (the last ',' always contained 2 non-null children).
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Context
,nodes were used to make lists, but that made it confusing since,is also used for the comma operator whose nodes had a slightly different shape (the last,always contained 2 non-null children).This PR replaces these
','nodes with a new kind of nodes only used for lists. This will make it easier in a follow up PR to convert the AST to a s-exp form.