Before the fix:
```
Pipeline standard for AVRule79::exprReleases/3#e849cdd3@f2995ebb was evaluated in 5 iterations totaling 168745ms (delta sizes total: 12583).
85855 ~0% {2} r1 = SCAN `AVRule79::exprReleases/3#e849cdd3#prev_delta` OUTPUT In.1, In.2
85855 ~0% {2} r2 = JOIN r1 WITH `AVRule79::exprOrDereference/1#c20425a1_10#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
115767 ~6% {2} | JOIN WITH `ASTValueNumbering::GVN.getAnExpr/0#dispred#a14f45bf_10#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
333369 ~18% {2} | JOIN WITH `ASTValueNumbering::GVN.getAnExpr/0#dispred#a14f45bf` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
266264 ~204% {2} | JOIN WITH `Access::Access.getTarget/0#dispred#cf25c8aa` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
16379 ~21% {3} | JOIN WITH `Function::Function.getParameter/1#dispred#200dcf26_201#join_rhs` ON FIRST 1 OUTPUT Rhs.2, Lhs.1, Rhs.1
13117819221 ~0% {4} r3 = JOIN r2 WITH `Call::Call.getArgument/1#dispred#ada436ba_102#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.2, Lhs.1, Rhs.2
10477 ~3% {3} | JOIN WITH `Call::FunctionCall.getTarget/0#dispred#935da4c5` ON FIRST 2 OUTPUT Lhs.0, Lhs.3, Lhs.2
13117819221 ~1% {4} r4 = JOIN r2 WITH `Call::Call.getArgument/1#dispred#ada436ba_102#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1, Lhs.2, Rhs.2
13022632157 ~1% {5} | JOIN WITH `Call::FunctionCall.getTarget/0#dispred#935da4c5` ON FIRST 1 OUTPUT Rhs.1, Lhs.2, Lhs.1, Lhs.0, Lhs.3
3720 ~70% {3} | JOIN WITH `#MemberFunction::MemberFunction.getAnOverridingFunction/0#dispred#a6e65b9ePlus` ON FIRST 2 OUTPUT Lhs.3, Lhs.4, Lhs.2
115767 ~6% {2} r5 = JOIN r1 WITH `ASTValueNumbering::GVN.getAnExpr/0#dispred#a14f45bf_10#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
333367 ~20% {3} | JOIN WITH `ASTValueNumbering::GVN.getAnExpr/0#dispred#a14f45bf` ON FIRST 1 OUTPUT Rhs.1, _, Lhs.1
333367 ~12% {3} | REWRITE WITH Out.1 := 85
4 ~0% {2} | JOIN WITH exprs ON FIRST 2 OUTPUT Lhs.0, Lhs.2
4 ~100% {2} | JOIN WITH `Expr::Expr.getEnclosingFunction/0#dispred#3960f06c` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
0 ~0% {2} r6 = JOIN r5 WITH `Call::FunctionCall.getTarget/0#dispred#935da4c5_10#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
0 ~0% {2} r7 = JOIN r5 WITH `#MemberFunction::MemberFunction.getAnOverridingFunction/0#dispred#a6e65b9ePlus#swapped` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
0 ~0% {2} | JOIN WITH `Call::FunctionCall.getTarget/0#dispred#935da4c5_10#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
0 ~0% {2} r8 = r6 UNION r7
0 ~0% {3} | JOIN WITH `Call::Call.getQualifier/0#dispred#7d175544` ON FIRST 1 OUTPUT Rhs.1, Lhs.1, Lhs.0
0 ~0% {3} | JOIN WITH `AVRule79::exprOrDereference/1#c20425a1_10#join_rhs` ON FIRST 1 OUTPUT Lhs.2, Rhs.1, Lhs.1
14197 ~18% {3} r9 = r3 UNION r4 UNION r8
12615 ~3% {3} | AND NOT `AVRule79::exprReleases/3#e849cdd3#prev`(FIRST 3)
return r9
```
After:
```
Pipeline standard for AVRule79::exprReleases/3#e849cdd3@13dead04 was evaluated in 5 iterations totaling 68ms (delta sizes total: 12551).
85855 ~0% {2} r1 = SCAN `AVRule79::exprReleases/3#e849cdd3#prev_delta` OUTPUT In.1, In.2
85855 ~0% {2} r2 = JOIN r1 WITH `AVRule79::exprOrDereference/1#c20425a1_10#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
115767 ~6% {2} | JOIN WITH `ASTValueNumbering::GVN.getAnExpr/0#dispred#a14f45bf_10#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
333443 ~18% {2} | JOIN WITH `ASTValueNumbering::GVN.getAnExpr/0#dispred#a14f45bf` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
265872 ~204% {2} | JOIN WITH `Access::Access.getTarget/0#dispred#cf25c8aa` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
16399 ~27% {3} | JOIN WITH `Function::Function.getParameter/1#dispred#200dcf26_201#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1, Rhs.2
10489 ~1% {3} r3 = JOIN r2 WITH `Call::FunctionCall.getTarget/0#dispred#935da4c5_10#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.2, Lhs.1
1558 ~80% {3} r4 = JOIN r2 WITH `#MemberFunction::MemberFunction.getAnOverridingFunction/0#dispred#a6e65b9ePlus#swapped` ON FIRST 1 OUTPUT Rhs.1, Lhs.1, Lhs.2
2196 ~7% {3} | JOIN WITH `Call::FunctionCall.getTarget/0#dispred#935da4c5_10#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.2, Lhs.1
12685 ~3% {3} r5 = r3 UNION r4
12581 ~3% {3} | JOIN WITH `Call::Call.getArgument/1#dispred#ada436ba` ON FIRST 2 OUTPUT Lhs.0, Rhs.2, Lhs.2
115767 ~6% {2} r6 = JOIN r1 WITH `ASTValueNumbering::GVN.getAnExpr/0#dispred#a14f45bf_10#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
333443 ~20% {3} | JOIN WITH `ASTValueNumbering::GVN.getAnExpr/0#dispred#a14f45bf` ON FIRST 1 OUTPUT Rhs.1, _, Lhs.1
333443 ~12% {3} | REWRITE WITH Out.1 := 85
4 ~0% {2} | JOIN WITH exprs ON FIRST 2 OUTPUT Lhs.0, Lhs.2
4 ~100% {2} | JOIN WITH `Expr::Expr.getEnclosingFunction/0#dispred#3960f06c` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
0 ~0% {2} r7 = JOIN r6 WITH `Call::FunctionCall.getTarget/0#dispred#935da4c5_10#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
0 ~0% {2} r8 = JOIN r6 WITH `#MemberFunction::MemberFunction.getAnOverridingFunction/0#dispred#a6e65b9ePlus#swapped` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
0 ~0% {2} | JOIN WITH `Call::FunctionCall.getTarget/0#dispred#935da4c5_10#join_rhs` ON FIRST 1 OUTPUT Rhs.1, Lhs.1
0 ~0% {2} r9 = r7 UNION r8
0 ~0% {3} | JOIN WITH `Call::Call.getQualifier/0#dispred#7d175544` ON FIRST 1 OUTPUT Rhs.1, Lhs.1, Lhs.0
0 ~0% {3} | JOIN WITH `AVRule79::exprOrDereference/1#c20425a1_10#join_rhs` ON FIRST 1 OUTPUT Lhs.2, Rhs.1, Lhs.1
12581 ~3% {3} r10 = r5 UNION r9
12576 ~3% {3} | AND NOT `AVRule79::exprReleases/3#e849cdd3#prev`(FIRST 3)
return r10
```
`class Env` was previously abstract with no concrete descendants, so user queries like `any(Env e | ...)` would never produce results.
In the JS library the corresponding class derived from `YamlNode` and has concrete descendants representing workflow-, job- and step-level `env` nodes. However these are dubiously useful since you can always just use `any(Step s).getEnv()` to achieve the same result. Since `EnvImpl` already fully characterises an `env` node, I simply make the class concrete.
