Vendor rustc_pattern_analysis

Version of rust-lang/rust#120027

crates/rustc_pattern_analysis/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "rustc_pattern_analysis"
+version = "0.0.0"
+edition = "2021"
+
+[dependencies]
+derivative = "2.2.0"
+rustc_apfloat = "0.2.0"
+rustc_index = { path = "../rustc_index", default-features = false }
+smallvec = { version = "1.8.1", features = ["union"] }
+tracing = "0.1"

crates/rustc_pattern_analysis/messages.ftl

@@ -0,0 +1,19 @@
+pattern_analysis_non_exhaustive_omitted_pattern = some variants are not matched explicitly
+    .help = ensure that all variants are matched explicitly by adding the suggested match arms
+    .note = the matched value is of type `{$scrut_ty}` and the `non_exhaustive_omitted_patterns` attribute was found
+
+pattern_analysis_non_exhaustive_omitted_pattern_lint_on_arm = the lint level must be set on the whole match
+    .help = it no longer has any effect to set the lint level on an individual match arm
+    .label = remove this attribute
+    .suggestion = set the lint level on the whole match
+
+pattern_analysis_overlapping_range_endpoints = multiple patterns overlap on their endpoints
+    .label = ... with this range
+    .note = you likely meant to write mutually exclusive ranges
+
+pattern_analysis_uncovered = {$count ->
+        [1] pattern `{$witness_1}`
+        [2] patterns `{$witness_1}` and `{$witness_2}`
+        [3] patterns `{$witness_1}`, `{$witness_2}` and `{$witness_3}`
+        *[other] patterns `{$witness_1}`, `{$witness_2}`, `{$witness_3}` and {$remainder} more
+    } not covered