Flash compile issue

Haxe: 4.2.5; OS type: windows;
File "src/generators/genswf9.ml", line 2839, characters 93-100
Called from file "src/generators/genswf9.ml", line 2839, characters 86-100
Called from file "src/generators/genswf9.ml", line 1132, characters 9-99
Called from file "src/generators/genswf9.ml", line 1838, characters 1-30
Called from file "src/generators/genswf9.ml", line 1727, characters 1-22
Called from file "src/generators/genswf9.ml", line 1097, characters 4-24
Called from file "src/generators/genswf9.ml", line 1101, characters 2-9
Called from file "src/generators/genswf9.ml", line 1846, characters 1-33
Called from file "src/generators/genswf9.ml" (inlined), line 1909, characters 9-41
Called from file "src/generators/genswf9.ml", line 2129, characters 11-51
Called from file "src/generators/genswf9.ml", line 2579, characters 8-41
Called from file "pMap.ml", line 157, characters 9-27
Called from file "pMap.ml", line 157, characters 14-26
Called from file "src/generators/genswf9.ml", line 2577, characters 14-324
Called from file "src/generators/genswf9.ml", line 2790, characters 13-33
Called from file "src/generators/genswf9.ml", line 2909, characters 8-27
Called from file "list.ml", line 117, characters 24-34
Called from file "src/generators/genswf9.ml", line 2908, characters 15-142
Called from file "src/generators/genswf.ml", line 231, characters 12-42
Called from file "src/generators/genswf.ml", line 603, characters 12-35
File "src/core/globals.ml", line 117, characters 1-7: Assertion failed

Reproduce the Flash compilation on Windows with Haxe 4.2.5, then inspect src/generators/genswf9.ml around lines 2839 and 2577-2909, with src/core/globals.ml:117 and src/generators/genswf.ml as context. Done means the same compilation no longer triggers the assertion failure.

Written by the indexing model from the issue text.