fn parseCallconv(p: *Parse) !?Node.Index
p: *Parse
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fn parseCallconv(p: *Parse) !?Node.Index { _ = p.eatToken(.keyword_callconv) orelse return null; _ = try p.expectToken(.l_paren); const expr_node = try p.expectExpr(); _ = try p.expectToken(.r_paren); return expr_node; }