tests/cases/compiler/unusedVariablesWithUnderscoreInForOfLoop1.ts(2,21): error TS6133: 'b' is declared but its value is never read.
tests/cases/compiler/unusedVariablesWithUnderscoreInForOfLoop1.ts(4,17): error TS6133: 'a' is declared but its value is never read.
tests/cases/compiler/unusedVariablesWithUnderscoreInForOfLoop1.ts(6,17): error TS6133: 'a' is declared but its value is never read.
tests/cases/compiler/unusedVariablesWithUnderscoreInForOfLoop1.ts(6,20): error TS6133: 'b' is declared but its value is never read.


==== tests/cases/compiler/unusedVariablesWithUnderscoreInForOfLoop1.ts (4 errors) ====
    function f() {
        for (const [_a, b] of [['key', 1]]) {}
                        ~
!!! error TS6133: 'b' is declared but its value is never read.
    
        for (const [a, _b] of [['key', 1]]) {}
                    ~
!!! error TS6133: 'a' is declared but its value is never read.
    
        for (const [a, b] of [['key', 1]]) {}
                    ~
!!! error TS6133: 'a' is declared but its value is never read.
                       ~
!!! error TS6133: 'b' is declared but its value is never read.
    }
    