ASSERT copies only 3 values for failed expression, also flaky

[Siskin-Bot]

Submitted by: fork

If an assertion fails, the resulting error message attempts to capture the failing expression that it detected. For some reason it only takes up to 3 elements of that expression.

>> assert [true 1 + 3 = 2 true]
** Script error: assertion failed for: [1 + 3] ; <-- HERE
** Where: assert
** Near: assert [true 1 + 3 = 2 true]

Additionally: because it only copies the expression out after running the assert, it can fail to capture an expression correctly if it modifies the block:

>> conditions: [true true (clear conditions false) true]
== [true true (clear conditions false) true]

>> assert conditions
** Script error: assertion failed for: []
** Where: assert
** Near: assert conditions

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^{Imported from: CureCode [ Version: r3 master Type: Bug Platform: All Category: Unspecified Reproduce: Always Fixed-in:none ]
Imported from: metaeducation#2231}

Comments:

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Rebolbot added the Type.bug on Jan 12, 2016

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Ladislav commented on Feb 7, 2016:

I never used ASSERT, and I do not want to change this habit. I do understand that this property is a disadvantage, but I do not think this can be corrected easily, and it can certainly be circumvented without much hassle.

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[Oldes]

I fixed the first part, ignoring the second one as I think that one is not supposed to do stupid things in assert conditions.