Rust Nightly Regression (6/23 to 07/01)

ainstructions.sh

#instructions to reproduce on a fresh ubuntu (with git, curl, and file)
curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain nightly
source $HOME/.cargo/env
rustup toolchain install nightly-2016-06-24-x86_64-unknown-linux-gnu
git clone https://github.com/steffengy/pesty-php.git
cd pesty-php
git reset --hard 1c29512104dd16b1f0a60d36ee01a23b51046bf2
rustc --version
#rustc 1.11.0-nightly (01411937f 2016-07-01) as of writing
cargo rustc -- -Z time-passes > dbg_2016-07-01_01411937f.txt
rustup run nightly-2016-06-24-x86_64-unknown-linux-gnu rustc --version 
#rustc 1.11.0-nightly (ad7fe6521 2016-06-23)
rustup run nightly-2016-06-24-x86_64-unknown-linux-gnu cargo rustc -- -Z time-passes > dbg_2016-06-23_ad7fe6521.txt
diff -u dbg_2016-06-23_ad7fe6521.txt dbg_2016-07-01_01411937f.txt > dbg.diff

dbg.diff

--- dbg_2016-06-23_ad7fe6521.txt	2016-07-03 11:40:37.880710300 +0000
+++ dbg_2016-07-01_01411937f.txt	2016-07-03 11:36:19.450710300 +0000
@@ -1,64 +1,64 @@
-time: 0.011; rss: 58MB	parsing
-time: 0.001; rss: 58MB	configuration
-time: 0.000; rss: 58MB	recursion limit
-time: 0.000; rss: 58MB	crate injection
-time: 0.000; rss: 58MB	plugin loading
-time: 0.000; rss: 58MB	plugin registration
-time: 7.904; rss: 120MB	expansion
-time: 0.000; rss: 120MB	maybe building test harness
-time: 0.000; rss: 120MB	checking for inline asm in case the target doesn't support it
-time: 0.007; rss: 120MB	complete gated feature checking
-time: 0.021; rss: 120MB	assigning node ids
-time: 0.011; rss: 123MB	collecting defs
-time: 0.005; rss: 123MB	external crate/lib resolution
-time: 0.018; rss: 123MB	early lint checks
-time: 0.003; rss: 123MB	AST validation
-time: 0.053; rss: 127MB	name resolution
-time: 0.030; rss: 138MB	lowering ast -> hir
-time: 0.005; rss: 141MB	indexing hir
-time: 0.004; rss: 141MB	attribute checking
-time: 0.003; rss: 125MB	language item collection
-time: 0.004; rss: 125MB	lifetime resolution
-time: 0.000; rss: 125MB	looking for entry point
-time: 0.000; rss: 125MB	looking for plugin registrar
-time: 0.020; rss: 130MB	region resolution
-time: 0.002; rss: 130MB	loop checking
-time: 0.002; rss: 130MB	static item recursion checking
-time: 0.000; rss: 130MB	load_dep_graph
-time: 0.015; rss: 132MB	type collecting
-time: 0.000; rss: 132MB	variance inference
-time: 0.047; rss: 139MB	coherence checking
-time: 0.055; rss: 139MB	wf checking
-time: 0.031; rss: 139MB	item-types checking
-time: 5.465; rss: 160MB	item-bodies checking
-time: 0.000; rss: 160MB	drop-impl checking
-time: 0.150; rss: 160MB	const checking
-time: 0.026; rss: 160MB	privacy checking
-time: 0.003; rss: 160MB	stability index
-time: 0.013; rss: 160MB	intrinsic checking
-time: 0.007; rss: 160MB	effect checking
-time: 0.045; rss: 160MB	match checking
-time: 0.025; rss: 159MB	liveness checking
-time: 0.105; rss: 159MB	rvalue checking
-time: 0.277; rss: 194MB	MIR dump
-time: 0.160; rss: 196MB	MIR passes
-time: 0.285; rss: 198MB	borrow checking
-time: 0.011; rss: 198MB	reachability checking
-time: 0.017; rss: 198MB	death checking
-time: 0.028; rss: 198MB	stability checking
-time: 0.000; rss: 198MB	unused lib feature checking
-time: 0.272; rss: 198MB	lint checking
-time: 0.000; rss: 198MB	resolving dependency formats
-time: 0.200; rss: 206MB	Prepare MIR codegen passes
-  time: 0.631; rss: 218MB	write metadata
-  time: 0.406; rss: 222MB	translation item collection
-  time: 0.009; rss: 223MB	codegen unit partitioning
-time: 3.842; rss: 273MB	translation
-time: 0.000; rss: 273MB	assert dep graph
-time: 0.000; rss: 273MB	serialize dep graph
-  time: 0.264; rss: 191MB	llvm function passes [0]
-  time: 0.078; rss: 192MB	llvm module passes [0]
-  time: 3.425; rss: 197MB	codegen passes [0]
-  time: 0.002; rss: 140MB	codegen passes [0]
-time: 4.120; rss: 135MB	LLVM passes
-time: 0.172; rss: 135MB	linking
+time: 0.013; rss: 62MB	parsing
+time: 0.002; rss: 62MB	configuration
+time: 0.000; rss: 62MB	recursion limit
+time: 0.000; rss: 62MB	crate injection
+time: 0.000; rss: 62MB	plugin loading
+time: 0.000; rss: 62MB	plugin registration
+time: 84.063; rss: 121MB	expansion
+time: 0.000; rss: 121MB	maybe building test harness
+time: 0.000; rss: 121MB	checking for inline asm in case the target doesn't support it
+time: 0.006; rss: 121MB	complete gated feature checking
+time: 0.024; rss: 121MB	assigning node ids
+time: 0.010; rss: 126MB	collecting defs
+time: 0.008; rss: 126MB	external crate/lib resolution
+time: 0.021; rss: 126MB	early lint checks
+time: 0.004; rss: 126MB	AST validation
+time: 0.056; rss: 130MB	name resolution
+time: 0.031; rss: 141MB	lowering ast -> hir
+time: 0.005; rss: 144MB	indexing hir
+time: 0.004; rss: 144MB	attribute checking
+time: 0.002; rss: 128MB	language item collection
+time: 0.004; rss: 128MB	lifetime resolution
+time: 0.000; rss: 128MB	looking for entry point
+time: 0.000; rss: 128MB	looking for plugin registrar
+time: 0.021; rss: 134MB	region resolution
+time: 0.004; rss: 134MB	loop checking
+time: 0.002; rss: 134MB	static item recursion checking
+time: 0.000; rss: 134MB	load_dep_graph
+time: 0.015; rss: 135MB	type collecting
+time: 0.000; rss: 135MB	variance inference
+time: 0.044; rss: 141MB	coherence checking
+time: 0.061; rss: 142MB	wf checking
+time: 0.034; rss: 142MB	item-types checking
+time: 5.754; rss: 162MB	item-bodies checking
+time: 0.000; rss: 162MB	drop-impl checking
+time: 0.150; rss: 162MB	const checking
+time: 0.016; rss: 162MB	privacy checking
+time: 0.002; rss: 162MB	stability index
+time: 0.011; rss: 162MB	intrinsic checking
+time: 0.008; rss: 162MB	effect checking
+time: 0.063; rss: 162MB	match checking
+time: 0.029; rss: 161MB	liveness checking
+time: 0.119; rss: 161MB	rvalue checking
+time: 0.320; rss: 197MB	MIR dump
+time: 0.157; rss: 198MB	MIR passes
+time: 0.283; rss: 201MB	borrow checking
+time: 0.010; rss: 201MB	reachability checking
+time: 0.017; rss: 201MB	death checking
+time: 0.030; rss: 201MB	stability checking
+time: 0.000; rss: 201MB	unused lib feature checking
+time: 0.268; rss: 201MB	lint checking
+time: 0.000; rss: 201MB	resolving dependency formats
+time: 0.199; rss: 208MB	Prepare MIR codegen passes
+  time: 0.677; rss: 220MB	write metadata
+  time: 0.550; rss: 225MB	translation item collection
+  time: 0.011; rss: 225MB	codegen unit partitioning
+time: 4.329; rss: 278MB	translation
+time: 0.000; rss: 278MB	assert dep graph
+time: 0.000; rss: 278MB	serialize dep graph
+  time: 0.277; rss: 184MB	llvm function passes [0]
+  time: 0.088; rss: 190MB	llvm module passes [0]
+  time: 3.631; rss: 200MB	codegen passes [0]
+  time: 0.002; rss: 143MB	codegen passes [0]
+time: 4.394; rss: 139MB	LLVM passes
+time: 0.184; rss: 137MB	linking