Switch to nightly due to stable compiler issue

Stable compiler currently allocates too much memory (56+ GB). Nightly (1.59)
is fixed with regards to this issue; 1.56.1 seems to have the same problem.

Author: Mark-Simulacrum

.github/workflows/bors.yml

@@ -12,8 +12,8 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - name: Install Rust stable
-        run: rustup update --no-self-update stable && rustup default stable
+      - name: Install Rust nightly
+        run: rustup update --no-self-update nightly && rustup default nightly
 
       - name: Check the code formatting with rustfmt
         run: cargo fmt --all -- --check
@@ -31,7 +31,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
-        channel: [stable, beta, nightly]
+        channel: [nightly]
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
@@ -61,8 +61,8 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - name: Install Rust stable
-        run: rustup update --no-self-update stable && rustup default stable
+      - name: Install Rust nightly
+        run: rustup update --no-self-update nightly && rustup default nightly
 
       - name: Run minicrater
         shell: bash

.github/workflows/pr.yml

@@ -8,8 +8,8 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - name: Install Rust Stable
-        run: rustup update stable && rustup default stable
+      - name: Install Rust nightly
+        run: rustup update nightly && rustup default nightly
 
       - name: Check the code formatting with rustfmt
         run: cargo fmt --all -- --check
@@ -28,8 +28,8 @@ jobs:
     steps:
       - uses: actions/checkout@v2
 
-      - name: Install Rust Stable
-        run: rustup update stable && rustup default stable
+      - name: Install Rust nightly
+        run: rustup update nightly && rustup default nightly
 
       - name: Build Crater
         run: cargo build

Dockerfile

@@ -19,7 +19,7 @@ RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
 # Install the currently pinned toolchain with rustup
 RUN curl https://static.rust-lang.org/rustup/dist/x86_64-unknown-linux-gnu/rustup-init >/tmp/rustup-init && \
     chmod +x /tmp/rustup-init && \
-    /tmp/rustup-init -y --no-modify-path --default-toolchain stable --profile minimal
+    /tmp/rustup-init -y --no-modify-path --default-toolchain nightly --profile minimal
 ENV PATH=/root/.cargo/bin:$PATH
 
 # Build the dependencies in a separate step to avoid rebuilding all of them

rust-toolchain

@@ -1 +1 @@
-stable
+nightly