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Fatal error: exception Ctype.Unify(_) #7766

vicuna opened this Issue Apr 9, 2018 · 1 comment


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commented Apr 9, 2018

Original bug ID: 7766
Reporter: Vincent L
Assigned to: @Octachron
Status: resolved (set by @Octachron on 2018-04-09T15:10:29Z)
Resolution: duplicate
Priority: normal
Severity: crash
OS Version: 10.11.6 15G2001
Version: 4.06.1
Fixed in version: 4.07.0+dev/beta2/rc1/rc2
Category: middle end (typedtree to clambda)
Duplicate of: #7695
Monitored by: @nojb @gasche

Bug description

When the attached file is compiled via ocamlc or ocamlopt, the compiler crashes with: “Fatal error: exception Ctype.Unify(_)” (Raised at file "typing/", line 2797, characters 6-45…).

OCaml 4.06.1 and 4.05.0 behave like this.

Earlier versions produce a sensible error message:

File "", line 25, characters 4-6:
Error: This expression has type unit P.gty P.gfunc
but an expression was expected of type int P.gty P.gfunc
Type unit is not compatible with type int

Additional information

When the commented line is uncommented, the program is well-typed and correctly compiled.

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commented Apr 9, 2018

Comment author: @Octachron

Thanks for the report! This issue is duplicate of 7695, and it will be fixed with the release of OCaml 4.07 .

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