[perl #129036] Assertion Failure: S_parse_ident (toke.c:8926)

# New Ticket Created by  Brian Carpenter 
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The attached script triggers an assertion failure in Perl v5.25.4 (v5.25.3-305-g8c6b0c7).

./perl test26
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 : toke.c:8926: void S_parse_ident(char **, char **, char *const, int, _Bool, _Bool): Assertion `((((U8)((*(((U8*)t)+1 )) | 0)) & 0xC0) == 0x80)' failed.
Aborted

• [perl #129036] Assertion Failure: S_parse_ident (toke.c:8926) by Father Chrysostomos via RT
• [perl #129036] Assertion Failure: S_parse_ident (toke.c:8926) by Brian Carpenter