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TypeScript Version: 3.1.0-dev.20180717
Code
type S = "a" | "b"; type O = { [S]: number };
Expected behavior:
Error message telling me to use K in S.
K in S
Actual behavior:
src/a.ts:2:13 - error TS2693: 'S' only refers to a type, but is being used as a value here.