Auto merge of #11195 - thvdveld:fix-option-env-ifs-equal-cond, r=Manishearth

fix: false positive for `option_env!` in `ifs_same_cond`

Clippy had a false positive for with `ifs_same_cond` when two if-let expressions have an `option_env!` macro. The fix is similar to the `env!` macro fix.

The following example had a clippy error:

```rust
if let Some(env1) = option_env!("ENV1") {
    // ...
} else if let Some(env2) = option_env!("ENV2") {
    // ...
}
```

See https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=01b85c61b56ddd900117fb247af04824

changelog: [`ifs_same_cond`]: fix false positive when using `option_env!` in if-let expressions.

Author: bors

clippy_utils/src/hir_utils.rs

@@ -494,10 +494,13 @@ impl HirEqInterExpr<'_, '_, '_> {
             loop {
                 use TokenKind::{BlockComment, LineComment, Whitespace};
                 if left_data.macro_def_id != right_data.macro_def_id
-                    || (matches!(left_data.kind, ExpnKind::Macro(MacroKind::Bang, name) if name == sym::cfg)
-                        && !eq_span_tokens(self.inner.cx, left_data.call_site, right_data.call_site, |t| {
-                            !matches!(t, Whitespace | LineComment { .. } | BlockComment { .. })
-                        }))
+                    || (matches!(
+                        left_data.kind,
+                        ExpnKind::Macro(MacroKind::Bang, name)
+                        if name == sym::cfg || name == sym::option_env
+                    ) && !eq_span_tokens(self.inner.cx, left_data.call_site, right_data.call_site, |t| {
+                        !matches!(t, Whitespace | LineComment { .. } | BlockComment { .. })
+                    }))
                 {
                     // Either a different chain of macro calls, or different arguments to the `cfg` macro.
                     return false;

tests/ui/ifs_same_cond.rs

@@ -46,6 +46,10 @@ fn ifs_same_cond() {
         // ok, functions
     } else if v.len() == 42 {
     }
+
+    if let Some(env1) = option_env!("ENV1") {
+    } else if let Some(env2) = option_env!("ENV2") {
+    }
 }
 
 fn issue10272() {

tests/ui/ifs_same_cond.stderr

@@ -36,13 +36,13 @@ LL |     if 2 * a == 1 {
    |        ^^^^^^^^^^
 
 error: this `if` has the same condition as a previous `if`
-  --> $DIR/ifs_same_cond.rs:54:15
+  --> $DIR/ifs_same_cond.rs:58:15
    |
 LL |     } else if a.contains("ah") {
    |               ^^^^^^^^^^^^^^^^
    |
 note: same as this
-  --> $DIR/ifs_same_cond.rs:53:8
+  --> $DIR/ifs_same_cond.rs:57:8
    |
 LL |     if a.contains("ah") {
    |        ^^^^^^^^^^^^^^^^