Error: Command failed: lfc "./lf/src/failing/Failing.lf" lfc: error: no viable alternative at input '!' --> lf/src/failing/Failing.lf:5:3 | 4 | main reactor { 5 | !reaction(startup) {= printf("Hello World.\n"); =} | ^ no viable alternative at input '!' | 6 | } lfc: fatal error: Aborting due to 1 previous error.

Error: Command failed: lff --check "./lf/src/failing/Failing.lf" lff: error: no viable alternative at input '!' --> lf/src/failing/Failing.lf:5:3 | 4 | main reactor { 5 | !reaction(startup) {= printf("Hello World.\n"); =} | ^ no viable alternative at input '!' | 6 | } lff: fatal error: Aborting due to 1 previous error.

Error: Command failed: lfc "./lf/src/failing/Failing.lf" lfc: error: no viable alternative at input '!' --> lf/src/failing/Failing.lf:5:3 | 4 | main reactor { 5 | !reaction(startup) {= printf("Hello World.\n"); =} | ^ no viable alternative at input '!' | 6 | } lfc: fatal error: Aborting due to 1 previous error.