diff options
author | Benjamin Barenblat <bbaren@debian.org> | 2018-12-29 14:31:27 -0500 |
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committer | Benjamin Barenblat <bbaren@debian.org> | 2018-12-29 14:31:27 -0500 |
commit | 9043add656177eeac1491a73d2f3ab92bec0013c (patch) | |
tree | 2b0092c84bfbf718eca10c81f60b2640dc8cab05 /test-suite/bugs/closed/5321.v | |
parent | a4c7f8bd98be2a200489325ff7c5061cf80ab4f3 (diff) |
Imported Upstream version 8.8.2upstream/8.8.2
Diffstat (limited to 'test-suite/bugs/closed/5321.v')
-rw-r--r-- | test-suite/bugs/closed/5321.v | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/test-suite/bugs/closed/5321.v b/test-suite/bugs/closed/5321.v new file mode 100644 index 00000000..03514e23 --- /dev/null +++ b/test-suite/bugs/closed/5321.v @@ -0,0 +1,18 @@ +Definition proj1_sig_path {A} {P : A -> Prop} {u v : sig P} (p : u = v) + : proj1_sig u = proj1_sig v + := f_equal (@proj1_sig _ _) p. + +Definition proj2_sig_path {A} {P : A -> Prop} {u v : sig P} (p : u = v) + : eq_rect _ _ (proj2_sig u) _ (proj1_sig_path p) = proj2_sig v + := match p with eq_refl => eq_refl end. + +Goal forall sz : nat, + let sz' := sz in + forall pf : sz = sz', + let feq_refl := exist (fun x : nat => sz = x) sz' eq_refl in + let fpf := exist (fun x : nat => sz = x) sz' pf in feq_refl = fpf -> +proj2_sig feq_refl = proj2_sig fpf. +Proof. + intros. + etransitivity; [ | exact (proj2_sig_path H) ]. + Fail clearbody fpf. |