Paul King created GROOVY-12097:
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Summary: a[index] = expr evaluates RHS before index, breaking
left-to-right evaluation order
Key: GROOVY-12097
URL: https://issues.apache.org/jira/browse/GROOVY-12097
Project: Groovy
Issue Type: Bug
Reporter: Paul King
AI read:
The intent of GROOVY-2556 was to stop double-evaluating the object/index in
compound subscript assignments (x[i] += v) — the first hunk of that commit.
Reordering plain = was an unintended side effect of the "related problems"
cleanup.
GROOVY-2556 fixed some cases involved array expressions with side effects but
also changed the index value on the LHS of an assignment. The following Java
and Groovy program gave the same result prior to the change (Groovy 1.5.2ish)
but the behavior below since then:
{code:groovy}
public class C {
public static void main(String[] args) {
int[] a = new int[]{-1, -1, -1, -1};
int x = 0;
int y = 3;
a[x] = x++;
a[y] = --y;
System.out.println("[" + a[0] + "," + a[1] + "," + a[2] + "," + a[3] + "]");
// Groovy: [-1,0,2,-1], Java: [0,-1,-1,2]
}
}
{code}
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