Matt Wette writes: Hi Matt! The second tcc.c problem looks like a silly little bug? Backtrace: 19 (apply-smob/1 #) In ice-9/boot-9.scm: 713:2 18 (call-with-prompt _ _ #) In ice-9/eval.scm: 619:8 17 (_ #(#(#))) 619:8 16 (_ #(#(#(#(#(#(#(#(#(#(#(#(#(#(#(#) …) …) …) …) …) …) …) …) …) …) …) …) …) …)) In ice-9/ports.scm: 462:17 15 (call-with-output-file _ _ #:binary _ #:encoding _) 473:4 14 (with-output-to-port _ _) In ice-9/eval.scm: 293:34 13 (_ #(#(# () () ("bugs/is-space.c") #f #f () ()))) In srfi/srfi-1.scm: 592:17 12 (map1 ("bugs/is-space.c")) In ice-9/ports.scm: 444:17 11 (call-with-input-file _ _ #:binary _ #:encoding _ #:guess-encoding _) 469:4 10 (with-input-from-port _ _) In /tmp/guix-build-mes-git.drv-0/source/module/language/c99/compiler.mes: 2194:16 9 (_) 99:21 8 (c99-input->ast #:defines _ #:includes _) In ice-9/boot-9.scm: 837:9 7 (catch c99-error # # …) In nyacc/lang/c99/parser.scm: 85:13 6 (_) In ice-9/boot-9.scm: 837:9 5 (catch nyacc-error # # …) In nyacc/parse.scm: 104:35 4 (_ # #:debug _) In nyacc/lang/c99/body.scm: 537:21 3 (_) 519:16 2 (read-token) In nyacc/lex.scm: 274:28 1 (read-c-chlit _) In unknown file: 0 (scm-error misc-error #f "~A" ("bad escape sequence") #f) ERROR: In procedure scm-error: ERROR: bad escape sequence