<compile-time thru statement>

── ̍THRU ──<compile-time arithmetic expression>── DO ──────────────────►
►─<compile-time statement>─────────────────────────────────────────────┤

The 'THRU statement provides iterative compilation of ALGOL source input. The compile-time arithmetic expression must have a value greater than or equal to zero.

The compile-time statement following DO is processed <compile-time arithmetic expression> times. If this value is zero, the 'THRU statement is skipped.