patch 8.1.0990: floating point exception with "%= 0" and "/= 0"v8.1.0990

Problem:    Floating point exception with "%= 0" and "/= 0".
Solution:   Avoid dividing by zero. (Dominique Pelle, closes #4058)

1 files changed, 38 insertions, 1 deletions

diff --git a/src/testdir/test_vimscript.vim b/src/testdir/test_vimscript.vim
index 41a1dda7d..57e673f3a 100644
--- a/src/testdir/test_vimscript.vim
+++ b/src/testdir/test_vimscript.vim
@@ -21,7 +21,7 @@ com! -nargs=1	     Xout     call Xout(<args>)
 "
 " Create a script that consists of the body of the function a:funcname.
 " Replace any ":return" by a ":finish", any argument variable by a global
-" variable, and and every ":call" by a ":source" for the next following argument
+" variable, and every ":call" by a ":source" for the next following argument
 " in the variable argument list.  This function is useful if similar tests are
 " to be made for a ":return" from a function call or a ":finish" in a script
 " file.
@@ -1457,6 +1457,43 @@ func Test_compound_assignment_operators()
     let x .= 'n'
     call assert_equal('2n', x)
 
+    " Test special cases: division or modulus with 0.
+    let x = 1
+    let x /= 0
+    if has('num64')
+        call assert_equal(0x7FFFFFFFFFFFFFFF, x)
+    else
+        call assert_equal(0x7fffffff, x)
+    endif
+
+    let x = -1
+    let x /= 0
+    if has('num64')
+        call assert_equal(-0x7FFFFFFFFFFFFFFF, x)
+    else
+        call assert_equal(-0x7fffffff, x)
+    endif
+
+    let x = 0
+    let x /= 0
+    if has('num64')
+        call assert_equal(-0x7FFFFFFFFFFFFFFF - 1, x)
+    else
+        call assert_equal(-0x7FFFFFFF - 1, x)
+    endif
+
+    let x = 1
+    let x %= 0
+    call assert_equal(0, x)
+
+    let x = -1
+    let x %= 0
+    call assert_equal(0, x)
+
+    let x = 0
+    let x %= 0
+    call assert_equal(0, x)
+
     " Test for string
     let x = 'str'
     let x .= 'ing'