Hello there,
when touching this stuff, it would be extremely desirable primarily to fix the
scoping/obscuring of same-named variables, which Groovy at the moment does
wrong, same as the demented Java thing:
===
89 ocs /tmp> <q.groovy
def i=0 // outer
println "i=$i (outer)"
for (int i=1 /* inner */;i<2;i++) println "i=$i (inner)"
println "i=$i (outer again)"
89 ocs /tmp> /usr/local/groovy-4.0.0-alpha-1/bin/groovy q
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
/private/tmp/q.groovy: 3: The current scope already contains a variable of the
name i
@ line 3, column 10.
for (int i=1 /* inner */;i<2;i++) println "i=$i (inner)"
^
1 error
90 ocs /tmp>
===
This is how it should work:
===
90 ocs /tmp> <q.c
#include <stdio.h>
int main() {
int i=0;
printf("i=%d (outer)\n",i);
for (int i=1 /* inner */;i<2;i++) printf("i=%d (inner)\n",i);
printf("i=%d (outer again)\n",i);
return 0;
}
91 ocs /tmp> cc -Wall q.c && ./a.out
i=0 (outer)
i=1 (inner)
i=0 (outer again)
92 ocs /tmp>
===
Thanks and all the best,
OC
> On 2 Dec 2020, at 17:34, Milles, Eric (TR Technology)
> <[email protected]> wrote:
>
> Traditional "for" (first example) and ARM "try" (last example) support local
> variable declarations that are scoped to the statement. In light of the
> upcoming "instanceof" enhancement in Java, I was thinking about possible
> alternatives for declaring local variables that have statement scope.
>
> for (int i = ...; ...) {
> // i available
> }
> // i unavailable
>
> for (x in y index i) { // from Gosu (http://gosu-lang.github.io/docs.html
> <http://gosu-lang.github.io/docs.html>) -- an alternative to using
> eachWithIndex
> }
>
> if (x instanceof T t) { // from Java 14+
> }
>
> if (def x = ...) { // tests Groovy truth in this form; may be wrapped in
> parens to check something else about "x"
> }
>
> try (def ac = ...) {
> }
>
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